Malicious PDF — malware analysis report

Static analysis result for SHA-256 37852d0d5f9fe9d1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 01:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 673304bb389ddbecc6b7f46c47b46cfc SHA-1: 5f01b9067f1e982b610a0652c930d8feb4ca7c2b SHA-256: 37852d0d5f9fe9d1a0450abd9ae6e8b7b67f46cadaba2983e1754541b911308b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d019a500de---54272687071.pdf In PDF document text
    • https://guineaservicesproviders.com/gsp/files/56546540328.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lk0sqrc8eksnps5dl7tmg693fl/17801763572.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/59807373535.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/48126404782.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/44661462172.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/lanijofebodoginoparo.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/vofod.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/zebapigemanepewu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21d66aedf---giputowuvuluw.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/14672166750.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/74887475292.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/6646118098.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r8cpbtkqr5uar1lmh56ipp9ju7/pasuluwamo.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/62845000332.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/28774087328.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f34e0cbcf3a3508fef9cbe5a2a1e4991/xufewuxebazari.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210624_053618.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/pabogo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40566079472.pdfIn PDF document text
    • https://tonitomov.com/picture/file/97255971911.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917bc25f96e---68940179648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fiscal+decentralisation+in+malawi+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/57481265629.pdfIn PDF document text
    • 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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 16328 bytes
SHA-256: 0efc5835a610bee58703aa51c005e8b6f7f9abc3ae0a1462bf36ad94b3b707ab
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 10844 bytes
SHA-256: ea0250134a8f999469e04ceba57dbb3d694c39a9ef3ed0f8fed0ff1fe4ef64ac
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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