Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a67691e438a4a…

MALICIOUS

PDF

79.7 KB Created: 2021-07-26 03:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4480b600ec0f9f2494d5f273d463a100 SHA-1: 5a24c4338e28753bf01858c70112e1a0f6ebd704 SHA-256: 6f4a67691e438a4a93b548b0005ea3b71ed77499e9ee53d7c1e23e317ea09a2b
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple external websites, many of which appear to be compromised WordPress installations. The document's structure and embedded URLs suggest an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 4

  • 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
  • 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://magerp.org/upload/files/32126277648.pdf In PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/limuwaxuxegozarakewa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3f69506715fc3aa34cb609470531e1a8/penip.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qtievm6a6bo9g5edkipj3aiaun/farixenegekexusu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/zuwukimufukewomakuru.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/damelo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a266ab35df1---wetefunugutamedopexapita.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55c45eba4---kuvekeki.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/42985660508.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/76550840419.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/689a79bb872f22db4b4745c8b457f698/mogilesazovijapos.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/94429653003.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/9269090781.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a429d6f15b5---pugugamejidaz.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefe7cc2f9---8568329698.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/73341099281.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/zigutofepuzol.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89695365394.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/nuwixinujosoledo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/58464726875.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9ab4b4b11427052f424b153c75f38d67/48883416148.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vuvagaloker.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/13403489445.pdfIn PDF document text
    • https://pichsas.com/file/21766129618.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/budibifagab.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/lisenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+taking+too+much+calcium+supplements+cause+hypercalcemiaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16688 bytes
SHA-256: ba3dcf55d248397c5cd26ff1328c309cf8b6d6c0d63034192926b8e3b134d421
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 11160 bytes
SHA-256: c4587543961ac76952e03a114ee90a22112f7ec3961131786a484ca6cf9e841b