Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa034d9831080f2…

MALICIOUS

PDF

81.8 KB Created: 2021-08-02 08:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3245e6cfe0b792930f6f2ab9bd4a1e2 SHA-1: 81997b340747eff8b8bf990594c8e6394cb1b1b8 SHA-256: 1fa034d9831080f2c35e1053dc63371cccfcf7d911deefb8a82777092cb40fb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c31d99463---tobiruzekolomis.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1bfb2cea---89160700319.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/nonipuwevaw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/90059693667.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/efbc9a71bba366d13717734150894309/26832876374.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/nrrbp37huaqj0j0p1efrad8i18/5657337844.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5fa5851a28d8009901f8bd42a47e062c/75581791884.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/29209265878.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zanekufejitupofoxajafefiv.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/bibemegobuduzidevivazelaf.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729f7b086ef---zawawusefex.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/gebirazibi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/81b79b296805da11f8e61d3b4582d8f2/sopawokikiliremefiwiwigib.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6a3e3f3a4c87bcf058ef65240947faaa/90801819901.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fc1c85d---waxelokali.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/sakivami.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/11567421047.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/5085265945.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/53759149529.pdfIn PDF document text
    • http://landpas.pl/upload/file/wopexofekotogunalakafi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/90912615724.pdfIn PDF document text
    • http://juentai.com/userfiles/files/55750209393.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeae002e2c---9786349270.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/no8dh9hb8ju9dm0kvovkfppmoc/87262476126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+britain+built+the+modern+worldPDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10660 bytes
SHA-256: cb05102c4e40947db1eae6264e990c4ba1ed7fafda29f876a1eea25ed961f39d
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 17920 bytes
SHA-256: ffd46c5560b30640d20a88ee537801aafdfe48179a4d75b8212d21fe59ff9b86