Malicious PDF — malware analysis report

Static analysis result for SHA-256 7376b3babf0b00c1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 15:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1edc636add972c65dc687ab1579f0b00 SHA-1: b30717edbb56751a834d0cd3cb908c03298bdf9e SHA-256: 7376b3babf0b00c1af79c1f38722ce0b9bff7bb67f04a4eefd228f57c875726b
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 ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as landing pages for further malicious activity. The document's structure and embedded URLs suggest it is designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/uplcv?utm_term=electric+charge+coulomb%27s+law
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a7c82bc9ecfbdfff11da8484d45bbb3/munutukutarufuw.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b40402758cd---979852238.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e460e8a53351a53348d1ca96db09bce5/jezegagasazigodune.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7de308ee---dukonefagajuwedalefebawu.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/dad5a298d17900dd260b0567fa3912c7/49154354260.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad733901f2e---87288685983.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/ketibawanenogoxekusefome.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ffc87e00dc42e3131b27e136fa408846/nakakonuvusorokajulomaxof.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bd9cf76a---puropabiwigabewosigu.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bgldq3fuor90jqhhtojk1ec9jk/kibufofezexurisijogomiwa.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160956127d45fd---4515869833.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787de1a69d4---kavoguvomitamus.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc9921095---46802137460.pdf
    • http://stattus.com/assets/file/24397842931.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/bcu2fm6hhdmcmvj35hiik9dm83/40317755616.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ae119b6b---4432088452.pdf
    • http://jshtextile.com/UserFiles/file///93738054009.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcibrk5mur59b0qjdp4tqolqq3/27761319282.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076a41a4a035---36113556470.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
font_01_sfnt_off000100f8.bin
e5673870661aacd50124d3102811b2439a94fb87e912bd2eb9d90b673a3a59a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10916 bytes
font_02_sfnt_off00011a59.bin
0c9edc4c58907535e11e475dda127b6776b28e1f3feed90cde622ae44ae0b52f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 18188 bytes