Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fff5f2ac3cacdf…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f137e87c1fc538e8ce8b9c1ba109f699 SHA-1: 9039670f4149ad065452166bd2c32b0f31c1d4b0 SHA-256: 35fff5f2ac3cacdf8707f20c1d809ca54ffc9fac76d612ee2ed02656a265506a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous embedded URLs, many of which point to domains that appear to be used for hosting files or as part of a link farm. The presence of compromised CMS upload links and disposable hosting suggests an attempt to obscure the true nature of the hosted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lostfoundglobal.com/userfiles/file/3355904966.pdf In PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wumojenowobimenagusajodo.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wiwokoxulafamegarat.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_051324.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1c997659---52908263589.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5e38d10db4be3665ea395f31efaa398e/60614599820.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/sunuverex.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/23557393789.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381d186ad07---sukajapomef.pdfIn PDF document text
    • https://fasleh.net/Files/files/25121486461.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e18954c834adc6f2f8fc400180ccef0e/tomepivumogoj.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikuwaboburitolarekor.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/tijutozi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50522531488.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c47d077c8---wazuruvege.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/160058485861331689cca42.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/muzofirezikuw.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374929b199f---57835833745.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/85130319167.pdfIn PDF document text
    • http://mrybalko.ru/files/demilimodal.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/53241488948.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pesafetisomozajozubifenap.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gotutiwaruxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=new+movies+in+tamilrockersPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 17264 bytes
SHA-256: c17de742b2696939b1f24dd9bbd42c817636aa5d520a828878097a814bf6808e
font_02_sfnt_off00014876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14876 10612 bytes
SHA-256: fa20a428e3dd4d025a37b08fdedcc1c9e7523b77bd72f324249e55196088de0c

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