Malicious PDF — malware analysis report

Static analysis result for SHA-256 227cf3955b73ec52…

MALICIOUS

PDF

93.4 KB Created: 2021-07-30 23:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1cc10681a267cb32c8393c497f34fca SHA-1: 9a13bc0df9dd72f1c09f7e69a7859840c1201876 SHA-256: 227cf3955b73ec5253eb0d3380731b2c730590df4043f96d868598b13db97a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vclhp7qpgkojml3cre1ecp8397/98819965306.pdf In PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/lafesonexulajudegegafex.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f25c2155a---60402236708.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c6o60dk56mg00gu2gfrbsgk3ap/18734786266.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c302248e1b3a2067ad70f4edb2524fef/41805201707.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c691f091020---77511252094.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/jibezomabuburo.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/36930570810.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/15773611862.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b01f32387ac54322e662e679d1f1e92e/25412405735.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/apdshffhl9rdkkcngqsv8aksj2/miwelomuxisamumopisabobuw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0144c145---65892420829.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/76043959584c06f0cf179cf404cd6fce/34123504866.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0699a8ef9d---79001540316.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/61969807446.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e89d02ea---tupiserikaze.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/fijejonamikima.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1fc6a552---befesumepuwakitewerakusi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nbcs4lgj4ikfip61elefq0cref/punupofigumajatanolamu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/342c562b522be34e8c6575435d6a10d3/46551102361.pdfIn PDF document text
    • http://51www.org/uploadfile/file/8e9e7c550a8d872e1e69e9a48bf8eada.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c85849c141a---99433843219.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5u00sjbtbmfuaqc2nefqlosipn/bajixi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a896c550ab2---73136615966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+much+is+iron+sheets+in+kenyaPDF 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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 10832 bytes
SHA-256: b44a5bcb9de788508a85285e19fddb79d05abb43cf3fe729ec246b6975966b59
font_01_sfnt_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 17552 bytes
SHA-256: e94db0929e4aa91d0be0131e2fbb321d16292b8f25849c76f7dc0a88408d98bf
font_02_sfnt_off00014cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1