Malicious PDF — malware analysis report

Static analysis result for SHA-256 91effca93a3298c3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 23:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afbd90b9dbaa61c09aa40da441b92bc1 SHA-1: 7d255a6e32c91c703a2b5803cc281693b33a3d77 SHA-256: 91effca93a3298c3117007664c3b6b214be488af74e33075b92fd3220cc2615b
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crysiq.ru/uplcv?utm_term=cheek+cell+400x+magnification PDF link annotation
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/27747324878.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/72380439676.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b9affe5e8ec5a4da9f33186095588292/43937827518.pdfIn PDF document text
    • http://uhorder.com/upload/files/tikuma.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/vajoluzekokolevulapowokin.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/25d6982649d2e2fc8bd648c0f1c7cca0/31201782728.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/ziziwojesomuno.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jarifotur.pdfIn PDF document text
    • http://termocity.by/pics/files/sufutakogifibofe.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c23a235cb3f7a5482c4dfa77708ca352/detemunoz.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/40542516743.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1efff3d72ce2ace0fbdaf66cd0b2807f/tirulopavanipitijolap.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd99d7e6b2---62331113838.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cb3e2f5164c3ebb7a48fa7de0a599918/nawilupet.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/nukebuvediwoxugiguwib.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vavil.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/71784563123.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/rujupemumituzilosesamis.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9be126cc---duxoxa.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/zelitiliteluzofofupewob.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ecvltj38fb4uqiob3bbs02vupf/tuvupofelebufa.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10940 bytes
SHA-256: 4858a6018f50e9b1f7cffe31569f76a3e03af0e2ca27cf1409d12caf24609219
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 18136 bytes
SHA-256: 4a7ecd53ddcb34300737378ac5329089241b35d721cff7dfb099049ffd3bf84b

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