Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbdfdfd187b3cd6…

MALICIOUS

PDF

87.9 KB Created: 2021-07-27 05:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8a54b42ee10828c0458d851eb03fe68 SHA-1: 4b64093209f4e4c3af6c45396e6ff4bec0e513a1 SHA-256: fbbdfdfd187b3cd626a372cb651e1a00b2cf624c56056ca4b870d1814f60e516
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072de8d27c24---95386970424.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098365070145---soraxanazov.pdf
    • https://angkagenap.com/contents//files/xosalerapadodegaxijiwar.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eas8i7pii9dr43va1obk8b0t45/mafadagidisas.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/betiropiwukuw.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6ff226d5---8592740341.pdf
    • http://rauvuonsach.com/images/uploads/files/12242904386.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803bb00e1bd---juxijuziwixamaduzamekuwad.pdf
    • http://jevades.com/aircraft/fckimages/file/nixevosumaxuvubaradabe.pdf
    • https://psfund.org/public/uploads/files/cms_files/wamax.pdf
    • https://norservis.com/files/files/34352027105.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7lijds8aalgufsdedua5hmnb47/lewurirevusotunujumine.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/rawixadevego.pdf
    • https://residenciasanamaro.es/userfiles/files/13842195099.pdf
    • https://roc.mn/uploads/files/vibug.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807338c9c5c---xinowudugogaso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sq11+mini+dv+camera+manual+romana
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8e.bin
8cdf71c33ce60404f852878ee6a4e5b3c53dcdc81abf43d939aa871b16dbedb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 21156 bytes
font_01_sfnt_off00011fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 16792 bytes
font_02_sfnt_off000137d6.bin
d10e6a7b426642bf9b6f89236c82e876a84788614eb975599b575805a360961a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 10704 bytes

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