Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f8e772b352d1b0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 16:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5554a6f21f39545db6c1abfae8814fae SHA-1: f33aa3c9075e749a4e331a4e55c3662c60db3d18 SHA-256: 72f8e772b352d1b0a32e65b8b1c4b7408ae73a943a555d63e81e58ab044c0557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=open+thumbnail+file+android PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2321d958b---85404521910.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n2umfsb3gctisdkpg507kpvi64/wexaguxarun.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/71619134528.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/64317861294.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/86549561158.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/t9de8l8kvaiglpmqem6oenjti1/19990958668.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/341ecc7a65a091b23797b4e21049880f/xikisu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/20977730688.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/59899502635.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bevogitotoboluzopelekapuf.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lejegopej.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/jujakataxadijixijo.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/direzirizavox.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/006f46c1234cf997c82508a75c44f370/vabijidiwim.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/ruluwuzorugis.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/70655594281.pdfIn PDF document text
    • http://odumakus.com/uploads/files/26381872547.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/57593467462.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac4340fdf---78799237056.pdfIn PDF document text
    • http://topstec.com/d/files/neforidonujud.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/88034856115.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/vatekudiw.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72492173045.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/tazif.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10860 bytes
SHA-256: 5d02b42382b6f8c4226b8970ba16adbfdde97afc0e75de28ab2a37577360240f
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 17284 bytes
SHA-256: 35ee738ac1c4ca7303950a02391978e783296c9f3002bce24c58a79086105082

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