Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f16f6df342bd203…

MALICIOUS

PDF

116.1 KB Created: 2021-08-18 10:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cae26b7b1f5276be59b2c2f20d5cf95 SHA-1: 3cb157cf84dc7dac6fbf831405173df947dbe068 SHA-256: 7f16f6df342bd2032ae3449d718ce4279d7930f322f5b2601087696f0837d631
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://polimak.pl/userfiles/file/boduxisugotudapapinapipaw.pdf In PDF document text
    • http://studiotrusso.it/userfiles/files/54632283639.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524003412599842.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609676b6db741---gerureliwuve.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/ruluwofipegavip.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/29200482035.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddfc915e5---vugumapakag.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9d3aec4a---sasosexefodivojexew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8ea6e9c7---daramezelotaku.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7403f2cebcf8927ee55a38427b2c577a/deluxewuwixetep.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438245c4a1---nosodozikov.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160df3f48ecb63---wanamozotetodavuvorulud.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078daccf0f56---mexijopumudowipaxugu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/82345d4462da611920e347fca1d5b7c9/17249834647.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/nqok6aauho0onrpa737g60ocuh/63401218201.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/42215253741.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/259a4234d894718a2b1f7601fd404dcd/80739274351.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/zuwusirav.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/35713241202.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e083782ecb3c22200cf236306bd444fc/94638348503.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/zapotamo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c7a44771---zafobibodobax.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nawaw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9b1df586121810059371c3eaa6f13e1c/58835461859.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/rodebad.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/80663202207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+unlimited+ammo+cheat+code+xbox+360PDF 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_off00015fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEA 18264 bytes
SHA-256: 5638d73b2cff9cb4b3d4407c68186cfc1a89fed5951b6d223d7c90a3f2b6b79d
font_01_sfnt_off00018ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA7 11344 bytes
SHA-256: e7eb4a9e6b98f96a32ee5a271b0543a5497d5351d528c2d41f57cee3011e742c
font_02_sfnt_off0001a92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1