Malicious PDF — malware analysis report

Static analysis result for SHA-256 469cb4bfdb21ea1d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 12:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e670455877fcd95e3dc0b03f110f6660 SHA-1: 311c6f2014cc520a6dea8e36e239cbe5901b7d55 SHA-256: 469cb4bfdb21ea1da2501871c3b6fcb800135c7ac2f33620ea1df4349b41b52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host a collection of links for malicious purposes, such as phishing or distributing further malware. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=game+stuck+in+the+mud PDF link annotation
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/11130315789.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/59814501997.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/59392104818.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nixevatezetejibanotorim.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2d36a5070418ba1ecfb78dbc77d49926/18854539796.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625775854.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/18d878d6ebab6eb98b7e336ea54059c4/36369668266.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/49761303582.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/97591815024.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/57300274005.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kazegakelow.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/bebivafiziz.pdfIn PDF document text
    • http://dejede.com/userfiles/file/logubirukifefazobasobel.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/58728479069.pdfIn PDF document text
    • http://synphabase.ch/upload/file/sewojewetixuriduk.pdfIn PDF document text
    • https://fotovipvercelli.it/file/81922472549.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/wemezeriziki.pdfIn PDF document text
    • http://neteyes.eu/editor_up/jujiduwatipozenopupuwej.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/18751623287.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c99766741e5fa986065e604a89eb2156/42722691967.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160974e83224f3---rokamanobezawasufopa.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/nurojega.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/lebudimomuwefala.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 17332 bytes
SHA-256: e06019721821def74a6db1e74c61fcf30885f76eb255f65622a9df73d1744977
font_01_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 10600 bytes
SHA-256: bec03e2f1212959d95f0d2d8d79fc159e266fad366916045edd2f44c8f25a682