Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bf99a69375cf6e…

MALICIOUS

PDF

86.3 KB Created: 2021-08-30 23:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6dc7d56f4adbd359742ee9ce7bee5ba2 SHA-1: 53c33e04abc4ba3efb0e15d23939dbefa6d34a25 SHA-256: f2bf99a69375cf6e92a52e96075019892f0d0beb3de283e0d617b113e485ea93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9408e2bcb---wukesugoledepeme.pdf In PDF document text
    • http://positiveforce.in/uploads/files/1225740392.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zevosudexuxutiruruzibos.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/62106975118.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c4ab28eedae0c04c4bdd07db7759848d/goxisedurapinozuvimejit.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1b31407d---xoragefesasifew.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/wepejipatarisubum.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e72a09b1309619015299d5b6fc478672/lufog.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/95556006630.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/nisit.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b68cb06eb0---12197340182.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/pibuwekexupokup.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbe798370c---lorapigaji.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/13200688824.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075937f7997a---vududefasimef.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6kf70lf2kh8kgpu0t5ie8ti5d6/gizodagobipakolodu.pdfIn PDF document text
    • https://rosycaffe.com/file/8271323771.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mpuchj73m8745v6dhsb8q3l75f/93545502436.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/lijefegoleka.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/60eaaae13ec3625e54d343059f499ddd/40247619640.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/711f8b9451b4fdc1d100983bf5bb2ed5/49081494874.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/vidalasawepogisu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fagotagezaka.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66063af18f---dubanezibijomile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=would+you+rather+questions+for+teensPDF 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16980 bytes
SHA-256: 150755fd3607605ab10fda1242694eb22afa77ced6fa51eccfd86874ff8cde58
font_01_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 10804 bytes
SHA-256: 30b4b95445c9030cda9340ca9e6eb9f71c530446fe8fa4b51902bec88e0522fc

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