Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2d1f2fe1a2a618…

MALICIOUS

PDF

70.4 KB Created: 2021-06-06 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d19aac9bce499253752439f01581a01 SHA-1: ad47bfcdf4a2c408727a0e63a0ebb95a0d723db8 SHA-256: bb2d1f2fe1a2a618682fc056978db985a9df27fd9c4110fcc2d0f375e8186a0f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to grammatical terms, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=o+que+%25C3%25A9+adjunto+adnominal+brainly
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ccbfc53---tatibumaxipez.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/82843bbd0d51c968fb6f141e380d67e6/samewogib.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad330e9ff---mekuv.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/377c653b12d41fc73814745a12b6bd5c/vaxenuw.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609599d0464d7---29284644475.pdf
    • http://ufnk.fr/app/webroot/files/file/8733247969.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ccee58383---12645958616.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44d37e543---70037787384.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e81eb1258b3411b9bd98681765c3c199/52506569041.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f90229e44db2d4bb4a64a543c64c78/40563533090.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ab7a6e54b4feb35558026eb858b659aa/76253253886.pdf
    • http://notarbrazda.cz/userfiles/file/84201712948.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/voromidapafozoradokinu.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acfcd0dc8---46456636121.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074d898b03b2---88865671332.pdf
    • http://alkanboya.com/files/file/%5C/7337643643.pdf
    • https://llsindia.in/FCKeditor/file/mobujapukigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28b.bin
b75427ffeff3bc8420f5a7521774ba02cc85296ab014be0913e6bf1ab5dc9386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5408 bytes
font_01_sfnt_off0000e496.bin
a738beebddb4e1a9a89f07e795279b807e1387f2d8aa7303a10cd39094a37e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 12584 bytes

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