Malicious PDF — malware analysis report

Static analysis result for SHA-256 5167d2906cb08d32…

MALICIOUS

PDF

91.0 KB Created: 2021-07-01 19:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b13ef537fdc8b8c574fc8404016d2687 SHA-1: f7e97517ce4402e2639a26a337c41e95f06c5daa SHA-256: 5167d2906cb08d32e722228a17ba916385b7116766f429f1745cc10ac36743a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted from this sample, but the extensive use of external links suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=states+of+consciousness+psychology PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/rlo2hdg0ikrnr93284qt3f7idg/98288467138.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070694a61a71---wafitowabadew.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/32524245427.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/vutawoxawepe.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fe168ea63b1eb53bb9a3e7d26bb46108/guxevilunijojefakafeju.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13f157efc50c04edc5c536d69c234070/nixeponowibirafufimat.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dfe5331b9---74834982714.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7674b9fea---43351649491.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/22119770430.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08b976d80a---16692906458.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/bc1aa03b3448a02b7e6b998627a9606c/94014112289.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/galukidagi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pqq06pfbp57vimmoc4f84l2cf6/50336822653.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3fdfb2904---suselesoxusutezuxajeguro.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eabc8ea8f6e694ba67eb98e605aac807/gamub.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db78b12a39c8f769ee9beec4f8ca7af9/95020098361.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc146106b---talilaretitino.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/1017051552.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609005b4210b5---69790703618.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26ce19acc---polodomabure.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05d9185d5---54236985971.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c0f20faf7---rekiwesolexupi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/falezobanem.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/micjn2okqgk75gf9na5gt1idn1/xapugawatiga.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/dufepukaxefexegolalerul.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_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 17536 bytes
SHA-256: 9cd11fc003862a026889c93429e17aefa2e8ee5d22dae7a4af2e816cbdce1a10
font_02_sfnt_off00014541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14541 10948 bytes
SHA-256: f11b582ebd5c6eca7ccc33de7a8f0a5491f73549bec4eb033f62029ff77dfd2d