Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbdb40cb31672f8…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 07:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 102a15065bbb9b3fd60553cbea4729e5 SHA-1: cae92ab3ddea0e30b98c88fb1b7ef74170fead98 SHA-256: cdbdb40cb31672f8238da41fcd413be1b4d5dbfa822c83c7ac85e963f14cb953
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm strongly suggest this document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mamnonkitty.com/webroot/img/posts/files/suzegoredonimusatug.pdf In PDF document text
    • https://pearproperties.in/userfiles/file/feduvatulupinasunemizoj.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/de7dae45da1926190dc7f36e17b492a9/51258301570.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cae852758---60026715077.pdfIn PDF document text
    • http://ligneus.hu/upload/file/82067010683.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6ss9tpt3p4nqs8gg3mr2hs9pn7/51446013643.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18a16227c---68939732935.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7nuj8jovnlaoab59cckl72shla/7492699450.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f959631eb214f1381cb8cd1c08c80465/pojepavu.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/baa6172068da7fabbd2537e1277030c3/82738748102.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57425336532.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a799b6f7---66329812962.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe8e0d32---gegenivukabifatatulaverog.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/jugenitujekuveji.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d570316849---gozik.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/woluvotazupoju.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pipefiligozobuwixeruwu.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/tilenukepojiwejapalu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae367bad6f---jaragezisaxuzomikubiveka.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/46352451095.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbb28a06f---nililatuzamexejimosuzuf.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e81e9c82766---tofaxobe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7927ed15d6---80611771644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+can+i+get+deleted+messages+from+instagramPDF 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10896 bytes
SHA-256: a1ff28512e34b28bd74de74c31b33958960a7cb4724c83aabf24ecedc39ad6f9
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 17096 bytes
SHA-256: 9887b622c6cbe8e491e16571d640f58d8efeab433113e56d5036d876366976d9

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