Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4bc27e92c125a5…

MALICIOUS

PDF

73.4 KB Created: 2021-06-25 04:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 79e35f5886518adebee0cbdaeea1ddec SHA-1: 311c8a0be03ad69968d9915cf271e48a87cbfe09 SHA-256: cf4bc27e92c125a52f583870edce06fa39813d96ad847e63248be3ed3f2d317a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded content, though heavily obfuscated, suggests a lure related to employment exchange acts, likely to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://rajaketiga.com/contents//files/pirobab.pdf In PDF document text
    • http://salonorganica.ru/upload/files/pejovun.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/69532694106.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/298364444.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/63463159772.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/poleninuxorugose.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f222d291d8---28518724535.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/jivirokotesabototizodir.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/888ba0ed56a9d494b84773a91399a0f3/xifivegase.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/77143430360.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/53404443447.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bevogosibiwativigoka.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/27cbbab75552a561992a58cc04b25cb1/75744483104.pdfIn PDF document text
    • https://avela.md/userfiles/file/pexalidazogogaluda.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/2197382247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=employment+exchange+act+1959+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 5756 bytes
SHA-256: 3d8a283ce3f824ae648c39c1715379f41706edc8b1106c311cd59c4efe2cb699
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 11056 bytes
SHA-256: f430fdda4ad07e465e7b1180506e0e4a45c71ad47d0852b23a3c21644d30dd4c

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