Malicious PDF — malware analysis report

Static analysis result for SHA-256 296baab5df110d45…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 19:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 95bde2912a482a68e1f70b4198f97b06 SHA-1: a1e2789ed0cd8f6e6e3a0480d9fa24ffa4f55fb0 SHA-256: 296baab5df110d4573d9950843fd4a6e8a764384a7dc8eef6dbe1790e7d97a1f
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. It contains a large number of embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of numerous links and the nature of the hosting indicate an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sedaciesupravy.sk/media/file/67801436092.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131a95c2c344---51789749462.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613503e326ff0---zixulifiriwigevul.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/pijorafokafunaxukikib.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/xomofovusutu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36778247093.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ae45f32476b4d0e002b7522f4297415/39312987920.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/towosamufugasajuwerirofur.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/doxetulekitigufemaxigut.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zimuvonabofupunoba.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/21219288446.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/66481770706.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/tajexatarudugape.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/86478355924.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/terikalidofon.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/87375446323.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912e2c0225---zogikililupuwuditi.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/71965553998.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/nuwikoxofitolimaduzasilak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+mobile+iosPDF 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_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10376 bytes
SHA-256: 121207ed487966cd464e9676c09b7564b15c149d45cb7d8a07aeedb3b0407c72
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 19496 bytes
SHA-256: 42368c67905cb2d2f441e6a5a6690fcb5e3e80184c2ab1b94ae841cdb076bf5d