Malicious PDF — malware analysis report

Static analysis result for SHA-256 564c5b6bcee11c25…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 12:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f35d5fc55e9de6d6e6cc822d9fa39fc6 SHA-1: 06e1205b089eb07d86c5ae2f8ebfa9c51b72821b SHA-256: 564c5b6bcee11c25d61c316505d85088ac9262c85ae0206caecb6a871bc9cea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=al+anon+4th+step+inventory+worksheet PDF link annotation
    • http://cec-intl.ru/app/webroot/files/file/ranuvesewerorewukizusoxad.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/32365950343.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/javeletimilewabodi.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/naguzisujini.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7dc570ef---taxarugakijagodo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad71d527a66---jivijugemudikuzapun.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/womila.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/japoxupezeditena.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rj6hf3i5e987rn0qgkj6i42ub4/82168997560.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gusudutufigowapozasoliki.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b9d6a4ac---navofafopijebo.pdfIn PDF document text
    • http://strahyi.ru/images/file/fesisilotido.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a5678063---71824312050.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/4257878178.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be593e2d---bonaromonolazojoluti.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/51321809451.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13224782835.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/dazukagopeguvun.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/13019869558.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/18348200419.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c64987de3c1210e512377c73dbc218ef/sapejafetibudijep.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/furitavi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607456441db1d---82646277409.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 18384 bytes
SHA-256: 1355aa2fcfa5851b5a2edb547653b5ddafae49b4352bbb8953c7cd3e4c88e31d
font_01_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 10764 bytes
SHA-256: 4ddf5e7bc3b83e33e9bd36d1749a5500670f5b4540666c06f08dc20903a18b78

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