Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba5ee086dacdc83…

MALICIOUS

PDF

88.3 KB Created: 2021-07-28 00:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9171007b399a9fb82e888b0281b1d39a SHA-1: 53b0a0635964aeb8d3f3bb331efce3a319a06076 SHA-256: fba5ee086dacdc83d3a19fc6dc02f623f476c54b3fe85e713f59b17bc76f8a3e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xn--dlek-5qa.com/admin/UserFiles/file/67957917584.pdf In PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/d54f15modras9qrjg39ajrkgg3/wusutemetuvad.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda21a117a---mawekobevevebufulamazup.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/taduzikatenisuzakuwudinad.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/59919055679.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/nuter.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7i22iiu97hflnskfvomet0i26/40724761291.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/puzenenakafuvip.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/nutegolulixiro.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/rozaxidamagafagezofonut.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d9edb71618e5e861c521f3cb52befcb8/93872734620.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a597d742---zofalorotobexejog.pdfIn PDF document text
    • https://austarpharma.com/upload/files/8568049795.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bbccae709009975a6181e6542eb12840/59211284026.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/dixivuruwamimogerizomav.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/23407282948.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/pafavapem.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vizuxaniweriwuximozi.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/80856438969.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e0fd9e5a9ad81e9401a77f56f31cf960/tekekutoduvagu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/tarijobidabogepikawevibu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a2ee259a4---69381723657.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/janakirepovixapoxogel.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kujijik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=new+mot+testers+guidePDF 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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10444 bytes
SHA-256: 79efc544578a232c50661e5b855d613512a2d18a86ccb14f46a61a56c673c6cb
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 16736 bytes
SHA-256: a9f8804183ea84f252d4751e5a7e88ebc75ae91aac1d36fdfc9f40a790ba5e6e
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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