Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3f4ec2166a13c4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 21:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 317b78b0f63fd3071bdff5143b298cf4 SHA-1: 0b236b1f881018634cc7e416491d139cb067f5f3 SHA-256: 6c3f4ec2166a13c410ed4e3e50cba96aea508b0bc6accb5d04b0753d26a648c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final destination. No scripts were extracted, but the PDF structure itself facilitates redirection, aligning with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stef-nancy.fr/upload/document/71563166026.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/fizumu.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/64037302761.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b15d4bdee5caf7101250821ff118f6b/nefozovavox.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/52174122665.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62092377479.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/58224006003.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/14255122191.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161414f724cc12---fujafugowelemariruz.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lokejanusitosevefuk.pdfIn PDF document text
    • http://www.bandungmesin.com/file/59843616689.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/24159740190.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/kipominemozigupo.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/lenufogemevadasefonu.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/dulawojikuz.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/xekilatuzujokesegokatix.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/23211389847.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rafopidopiwefewowiru.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8cc82f526ce97707f994f24b1eb26b0a/tadipij.pdfIn PDF document text
    • http://jainfarms.com/uploads/14402814130.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/59570089946.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/7692574568.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zilipawatam.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/11254708835.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/82516763672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brick+mansions+streaming+vfPDF 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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 19460 bytes
SHA-256: da339a2cdd0f9118edcca29e1bcfbfb0326b42133c5672b1fcf3488af12ee0f4
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10844 bytes
SHA-256: eae86cca76c3429ae8eddea418083195ff5a4b22b799200ca748630fe62a028b