Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a85738c3f8688e…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 08:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a7bfb18cea0ccbc86c07a6a1a886ec SHA-1: e6c5a24f9fd8a30896ae66bcb69f9df8a8436f5d SHA-256: 35a85738c3f8688e7c471eabc0f01a31b7808baa7e4805e62df37f8512242e6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2309d97da817752e8bfc11c67df81788/zenojuzakewupovajevanofa.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1q6hbtfvvocem5kn05vo4hv2q5/56339368911.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bbfbf02817b9cc813ccd6df1d4783dd7/vawegufirofar.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08808e408---26310503728.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/23348031003.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n46bo7r4qavvj1b1jts4nnflvh/vovukomuxulirikawoboba.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0ef4cfb319b6811dd998500ab719577c/97692504647.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fd83d48b27c7ed31a292e9cae777659/rugapukaxizuni.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/firemapavegokutejadegotuz.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e0edef1ee22ff27479bdcf4054fa79db/4457676203.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gga0kaftdjcu3kepnmh53cdsk5/bofumojufiwereba.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b970c9dd88e---91638221460.pdf
    • http://cycling-software.com/files/file/87148202357.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fe2a5fc2b---fugesijoluvo.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79af56845---nurefelifegiregasawos.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a3840d085a8c215fac13e5134836250e/59303177996.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf05b68f5---30609422043.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/riekeam26rhjmdn9equd8njjfr/12412203047.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc79805225---79502991881.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071f53c3fa11---jabanivuxerurolu.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085946e5274e---69895300854.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t1knth313v43p4o214thdl4poh/29886959590.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ed30bd5c---84472524331.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=erie+county+pa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 16792 bytes
font_01_sfnt_off000100a9.bin
1c75a0957edf5a11754bfd60aadf4146e47c031e6c0ae3bb94beffd59544604f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10352 bytes
font_02_sfnt_off0001182c.bin
a6b29207cf1241876aead03e8f7079c650fbebf1688ac71c8da9864bda024394
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 17772 bytes