Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4be43753dbb31d…

MALICIOUS

PDF

94.4 KB Created: 2021-07-22 12:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c92a1333879c0f4e7731dadfcca54156 SHA-1: dd480d9c8c1ad3cd019387e69265b3bf91bb0dae SHA-256: 7a4be43753dbb31d0e3a9f535130402824dc2a24d9d42ec0f062f5fa885f0d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://alphabodysupplements.com/newerac2c/userfiles/file/putifapib.pdf In PDF document text
    • https://rabudiagnostic.com/userfiles/files/febunezodararirug.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/75654507490.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/13885020170.pdfIn PDF document text
    • http://banquat.com/userfiles/files/jovofutipebamibamawu.pdfIn PDF document text
    • http://mariancozma.com/_user/file/muzijubasiz.pdfIn PDF document text
    • https://gilbertems.com/videos/file/denuxojumadalopizipulobi.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/39037225026.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ii1b39ka8nrrad9pd4bof4b2ub/82818142445.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • https://combrooncom.com/contents//files/19351288233.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae2639306---31840599617.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/203c98e5990a9f0feb33a22c20000aea/masobuxagu.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/zesubulomanifasizimede.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/66391790074.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/bupevudavugolavezoxivon.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c6c7155d15150ffc4e4a80af2f3d8160/90740833334.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/26029508741.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b4b80b5719357dd63bd44f53f97a623a/leseweluvesataxife.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/vudisapudemej.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf7bd013b7---88604338956.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/32917792941.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tebabubej.pdfIn PDF document text
    • http://domplus.su/userfiles/files/68804175740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unrolled+egg+rollPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 17932 bytes
SHA-256: 44c52febcd97679f1c82d9bb0df9a6b40aedd78e1c8c99ce04e60ba2f82cc7b0
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 9912 bytes
SHA-256: 6f0555785f8750f86a0c329dfef6ced647206264fdee82247dcd3fdd1d7fcce6
font_03_sfnt_off000157c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C5 16224 bytes
SHA-256: d6dd8f09a97dbabc13652295f0acfdfb2300323efe6c6ce91bb145bb9206f541

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