Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3825f93a36351c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-10 09:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b5a2b882df9c617120e68f5b788ad18 SHA-1: 4e261b336bcdae57b9eda7b49adaad780f356ab7 SHA-256: 3d3825f93a36351c69101adfad514fe06cd3dc426f36e1dc92683c0936138d4c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f033840d5---mijovowu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ae8823a0eeaab843d832736b65a1c76f/12409307748.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd0ccf8fd---27812783074.pdf
    • https://senhewood.com/d/files/593532802.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5c3e49599c2557043b3e7eb97e017216/refirosu.pdf
    • http://anthonyvienna.com/sites/default/files/file/muzosiwe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27c8181ea---luboboxovebalorozowi.pdf
    • http://iaestedresden.de/userfiles/file/74682078134.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/25389058511.pdf
    • http://maciejabramowicz.pl/upload/files/file/bikewogofagezar.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/57643278590.pdf
    • http://interiorconsignments.com/media/file/limaxiwowisalituwur.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4e3dfc93---51506765786.pdf
    • http://rotang.net/userfiles/file/74207814004.pdf
    • http://alemotta.com/resources/original/file/dumaputukezajuvewirolaled.pdf
    • http://ecogestval.com/userfiles/file/vepovubonejajofajamunexe.pdf
    • http://riskhedgetech.com/uploaded/file/193448300060951136e1891.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d20a0e6e2f8---89076469544.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607343b48fe63---14739657604.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef86c407f---fezamenedilunenepu.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7af65a2b7---nusiborikikalu.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bb510e2ce---38331808007.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160853fbf49df1---94226600793.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e836accc---71584467971.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075879039807---monurepovamisoruw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quality+control+of+drugs+of+natural+origin+in+pharmacognosy
    • 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_off0000eb05.bin
b3fe94ff7482181f995f0ecd9cf769671192b5a0d108421a8da755090717bfa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 17060 bytes
font_01_sfnt_off00011743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 16792 bytes
font_02_sfnt_off00012f5a.bin
a4f337539c62e984c166daa95902e2814a62c0819a7732b57becc9a05f2f398c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 11208 bytes