Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b861badb107e4b…

MALICIOUS

PDF

110.3 KB Created: 2021-08-15 12:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7ae4bbe8075b2b0f8c6e9b6ad363b30 SHA-1: dac2adedc8d5d1c84915ff361651155b5efac361 SHA-256: 30b861badb107e4b522d034a33fa49e1063603a388ef4103ee25cc26597d1306
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sb-78.ru/files/file/vusomaxapirakewig.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/97643870342.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ctcpt3gi6vqhra2f66nguss573/37657415319.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fec78ad02086b2d358e65e1d6f3e37d8/pezugigisojoside.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a518da41a---38230352714.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5d34d39c2af181e6eb30ab0f8fba27aa/jawejitusi.pdfIn PDF document text
    • http://bankerz.in/qpic/files/15452280495.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/32025204207.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/modepugefelomugajunigax.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/37271006311.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/34516390209.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/tuxuvixetuwemulukosufoxes.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243c363c46---77038652703.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/muwoduselojosalabu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf4559846---58453660020.pdfIn PDF document text
    • http://scro.ru/pic/file/kuxetufimu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/44484513850.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/29sc5fb23m7aq0kar4nu7cul56/dobivevokurutolug.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ld4onrev3lc43sfm2o3bc9ttli/suxegavu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8e9e523f247b1472893d5cd55ea7cc6c/vidot.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/15198073760.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/57365963715.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/pabodelikagir.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/73945003265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=guardians+of+the+galaxy+vol+2+download+in+tamilrockersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16280 bytes
SHA-256: d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
font_01_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 20288 bytes
SHA-256: 1e2f56243a665be62c2f07133da7c6996b2593e237e60afbebc6f48b6527386d
font_02_sfnt_off00016dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD5 11640 bytes
SHA-256: 66ffe1eeb40b0600f6e23ceb3435382f3db9df06d1f651da0a74dc1a2fa84512
font_03_sfnt_off0001893c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1893C 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
font_04_sfnt_off000191a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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