Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2cdc83780f263e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca176923e00fad4a1420d00cf08175cd SHA-1: 886d3ab6e207a58199d01bb2b389bf4f3553aa46 SHA-256: 7d2cdc83780f263edf6cedbc73307507adae2a8bbf5878e3751e9cb171214e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://themis-lex.com/userfiles/files/61784231003.pdf In PDF document text
    • http://rucodelniza.ru/userfiles/file/49477539759.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/84289473638.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/60063078061.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/76919797210.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614893430334e---gevugijipolumag.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/40919552071.pdfIn PDF document text
    • https://digicpictures.com/downloads/89628269287.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/gagabe.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/6915850380.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/tixiwilisi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109211556324858.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/67223609998.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/maruzaseborotutowugi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pujajepozexorabubovi.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/deruzodexil.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85053079382.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f2t3d7jdf0ege9bcalhn1jnc49/xodenefaji.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc21fcb923---4316863602.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b2c9b4ad63ff00633b239e546d5037f8/53190968497.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gexupelozega.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/raxonitaxologulegalu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee4bc98c1---590123576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=delia+smith+mincemeat+cakePDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 14856 bytes
SHA-256: c6c0b34a12fda87b115121657af138d25c22f255e02f73fc77744a74a025fcbe
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10368 bytes
SHA-256: c620415ee1e09e8640063f818387d8a83b27a50af6b47e474bc3afcfd21f869c
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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