Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b76dee285808ea…

MALICIOUS

PDF

89.0 KB Created: 2021-08-12 17:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21f5fb9a4505ab757cac4604a1dd443c SHA-1: c6fc2aa675b2948acc4fc12f34982a5724784366 SHA-256: d2b76dee285808ea77b8d0908e86c71ad83d0c4eb571075fb10f22ceb5669550
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a 'Security software disable instruction' heuristic and a 'Password-protected archive handoff' lure indicates an attempt to bypass security controls and conceal a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=free+download+xilisoft+video+converter+ultimate+6+full+crack PDF link annotation
    • http://nm-union.ru/ckfinder/userfiles/files/73084486723.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7dcad9ff7b4c70370844c04eecde58e3/kawopigavikanusi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/5di2g7qjgeejn1ti3m9shgklra/wudonuvikerelikefa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b18240a26---34325801967.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/tinosapujezosarupab.pdfIn PDF document text
    • http://museeducuir.org/upload/files/jefawawasupeniruvijogoba.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fba7e8adea8100609abb8c78e02fca72/tuzuwuduzimab.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gipufujumujukediranok.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074947e76afe---januzatojigazobomojuf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f22ba5b3---sagugovowuzenasana.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qf4s3bbqlfodr4m7h2croanab2/vojoredeboritiperune.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1c75c25519ae6bb3d39311cd6cfc4653/torodorugerinosagoku.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pojijuxurazisotopaso.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160773861f326a---wegajok.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f7a4c08ac---41867062283.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b3570e560d75d06c06611417be0a258c/mekawo.pdfIn PDF document text
    • http://aplus.to/userfiles/file/39628138110.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/debubozirulemajupebif.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/98060955605.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p0mkj8pbsl23dgq1id3t9necom/30594826736.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a24997294---kumarokuxa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qebplrcjmj2t39n7q1lpr1umq1/jaribobuzan.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1e7e809061b705a4144fc228c8300682/76681571575.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/87096841536.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/rorixatitetafitabuju.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16868 bytes
SHA-256: d5adf88e8c23cb35247d24d4e03dc03f1e2caaee720671bba407968473aa0911
font_01_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 11228 bytes
SHA-256: bf1395f3f5f96837ed5d51f4e9b05f62fa1b9056f8e1f07fb5dae5681c1c0128

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