Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dc312117f436b3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 02:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6aef6a9f8db360928b11b81536ded77 SHA-1: e178a4569ea1e32c38735f29f76343058e58b8dc SHA-256: c7dc312117f436b3d7e00b1bf53753d37d4d0fe9d8b9969ef85b808c5c9356e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+install+apps+in+non+android+smart+tv PDF link annotation
    • https://cuatudongnhatrang.com/uploads/files/xufurugabamudulopokikig.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/43733796170.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/72676940986.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/49093676483.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kozovogoretawuver.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/buvajoxi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/npllta3k5bfrg1vm8o6fscr95k/bupomatebidagev.pdfIn PDF document text
    • http://djpress.pl/Image/files/laziferugebedup.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/tolanozojufugezetudekowix.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/32619384465.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/dudotirulovapiwix.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/wepisowu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2pnhd60q6vqrrpiujnqllhg5jq/vumafitewetajadamemolefud.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/vac6u2695oafl6t6253quhaag0/nedobomefirilifafes.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613074c0cc243---dunoratefupalaxuta.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_EBC9EB2C88E13CE3.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/36975489286.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/82417364725.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/83245596417.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/210d383b8dad2fa02fb4e90a02519236/lufoterelatuni.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381fbcefa93---57280724221.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/bopatidomal.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613102eae7be2---85819157946.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/59872815130.pdfIn PDF document text
    • http://vejwun.cz/images/sorofilix.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 16636 bytes
SHA-256: a446580b28b1963eb0df2765a02ec57f122f4fa06e391b6678cd21cc16b63cc6
font_02_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10564 bytes
SHA-256: f9e1aae67e0d10e56749d3b91726aa18a4b0a22fdc06899ba354cc72ef6a7d08

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