Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77211a365b56cc8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 21:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa9cacacac0106c95e949049c624f761 SHA-1: 4444312bb190261af90b3c24ea1df5197576cc44 SHA-256: a77211a365b56cc8c682f5fe671228b1be6b0473bd6befc61d533d2da0dfe00a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083664a0a62b---77823079691.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f54579b3---delujomebejudozafaxebovi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6786986a8c---xepuvekenowupovorapar.pdf
    • http://spreewaldatelier.de/img/editor/file/42704107304.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/esv49v7fo2olavccv1dr4uit9a/53781445305.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210822175817_ODA3ODA3MjU4MzE=.pdf
    • http://ingmontagna.com/userfiles/files/37600485791.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/15738253436.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kmjqvhb08902jcahejjplg7m26/42592605533.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/lawemuwavegu.pdf
    • http://atenngo.com/admin/sites/site/documents/43378607610.pdf
    • http://reclamesticker.nl/images/uploads/file/wunojabikixuwomaras.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094914733be3---gejopadexotubenubinawowex.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebd5c06ab8---59946683970.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kamv3ehrmsh2kvfum1a68auvp1/29685740190.pdf
    • http://domeinbeverdonk.be/assets/files/file/gazoxudo.pdf
    • https://stijsr.com/userfiles/file/96109748572.pdf
    • http://fotossc.pl/_files/file/83172499805.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7d9af392330d52ab881fb599d5e87f29/43176292562.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/25073100669.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/komikigilozesetufamora.pdf
    • http://ecohost.ru/pics/images/file/devivavuwumodoteputufawen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lcd+tv+troubleshooting+and+repair+pdf
    • 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_off0000c117.bin
92900ee6a3f18a2d6b666d1def31555b1efae811b8b945d055e017549cbc1b89
pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 11160 bytes
font_01_sfnt_off0000dab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 16792 bytes
font_02_sfnt_off0000f2c5.bin
094aa33ed8d4c762cc05636cb2a8cd4b9d113d7b7830f1e2a242aa2b5f2cb78e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 16220 bytes