Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5564850c147442…

MALICIOUS

PDF

85.5 KB Created: 2021-07-24 04:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d5b7f0b675704093a74a38595b6d2638 SHA-1: f26bd1530ff46fd4fa61a9765615d49c580bf230 SHA-256: 2c5564850c147442cf71a1d4b35d5394b7a51027f3a0125b8bc1452a79418734
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. The document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. A key finding is the 'Password-protected archive handoff' heuristic, indicating the document likely contains instructions to decrypt a subsequent payload, a common tactic to evade gateway security. No scripts were extracted, but the presence of multiple external links and the password protection heuristic strongly suggest an intent to deliver a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc7d552c2fc850a1f4a82e5532055a9a/mitakupinadamirivo.pdf In PDF document text
    • http://korytnica.net/data/files/32372084204.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vadejosakowewuvujuzuzifu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b2btbfkgk7kei0s259uvr438e4/poboxufusugigad.pdfIn PDF document text
    • http://vce34.ru/attachments/file/9303126976.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/72661746011.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kokunixojop.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/339f53c137549abcfb0db2c0c73ed063/13266124418.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/28320275076.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/84485898681.pdfIn PDF document text
    • http://18554080.com/userfiles/file/guwuluwuduvugulomoxesete.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/39312960551.pdfIn PDF document text
    • http://dalaichau.com/files/97168876597.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-7/20210507100553448830.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/60328531091.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/butizigedegoza.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b35c1274c550e2d3b18f4c1d99406785/64753792908.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609967152df7b---gatade.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4b956a71e4d1d67a02c7850417f1b956/tevufadepusojuteko.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f91gng05tcfsfovhf5e9pu22k7/wavoze.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5690b58898---63658156988.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/60053941306.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/71603222110.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/figasuwematuvoz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb40557de7---donisijevefuwuponodus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=unir+dos+paginas+pdf+en+una+sola+onlinePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10684 bytes
SHA-256: b6ea92c28757af5450b695721eb06ed23461cfd7650882cf25a99643cc66d1c8
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 17984 bytes
SHA-256: eda7af553f94d82e34e615680bc5a2a6895b8a4946cfae7b2bba3d2aaff45433

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