Malicious PDF — malware analysis report

Static analysis result for SHA-256 106cdd8c8851ecd6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 21:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 242f74a1d6e9c36a99dfa3b362d5aabe SHA-1: 3a3c0baa4ca615108a598c34872edc89d0e087cc SHA-256: 106cdd8c8851ecd6771b67a7185ce1293419b3f8a959bbcc1b1ce571a273b5d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a phishing or credential harvesting attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://akproauto.net/nbloom/fckuploads/file/71247572995.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942bafbf4e9---53288276222.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/83556042557.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/fimanezilegiki.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lb41c0o0fo89t26u1f0mh76mbp/gawexuxixodovuzekew.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/44272643356.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/lusoxefediwenem.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/97422430440.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/du1ik20hl8usj1pcmoh75mgopr/43659072091.pdfIn PDF document text
    • http://ailizia.com/userfiles/sisidavajeligobusi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i74o71u94jvn6lceaj02f140n1/mepinuxer.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f0854994---tadafinawedibewotani.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8925993091ceb26ebb63c11c4e5f52a1/mefigupu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a35f02d57---pipuzovev.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vagazuwofilijo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bg9r9nprbfqpp177lq9qctmfr2/56170912316.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/3189699799.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/32474226645.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/61157430839.pdfIn PDF document text
    • http://firegallery.ru/img/upload/5149944822.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/90860116854.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb59e38c1a---wawifaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=viavi+otdr+pdfPDF 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_off0000c205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 17884 bytes
SHA-256: 811d378391df795958376f7c1994bfb45a1ca67a600ad1d79bb09e7d9452bdd6
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 10076 bytes
SHA-256: 9de62b36d408219ece1dd43b28015e7f670484fa45059899efb07db33651a29b

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