Malicious PDF — malware analysis report

Static analysis result for SHA-256 25961368c598bf65…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 08:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d6ac5c9b0f00bea9e72a2813ffa4ed4 SHA-1: 0fd87e190eca05d690cd4e23dc7528128213d2fb SHA-256: 25961368c598bf65144addd48457fd0f618caf1fd08a8ce5af5d68c593cb367f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the structure suggests it's designed to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/wuwelofogifofop.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/skt8susilktlpcsficlhtokgu0/vololoporuvo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799a675ba3b---xugabepoxiruw.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/mabefozunewesawebu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kjhvusio07ctdck8d59rslkh2o/81427690070.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t2og3kvdohklghapdrobsjuc07/26525123211.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lojuzototemu.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/74472990801.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tesogifebilelusigag.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/51438403665.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/32656168794.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44151634062.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/girunelujikawizivopoj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7041221d56626c7d13298934ba4528b8/76810569154.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607136f99c3bb---41071567161.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jekazuwipuza.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c202f3b9dd5---56419071692.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/93043651007.pdfIn PDF document text
    • http://uchid.com/uploads/file/wibogojuzuwo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xidageruxugubunar.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608153e696358---gupegis.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a104a763e---rikanarule.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/totugitesomaxunuxa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cca97a0cb9---wexevatoxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toyota+yaris+verso+1999+service+manualPDF 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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10852 bytes
SHA-256: 467bbe94ab5bc7ff0316fb2e90d81d525ee720d13fa96f9367f9439aca84ee8d
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 17272 bytes
SHA-256: bf715f624348aeed0a978c86573a5660ca260bb64f612eac9fe08779a50ea527

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