Malicious PDF — malware analysis report

Static analysis result for SHA-256 921fb566807798e1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 09:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f5e1036e7ac73fd308450cef2984c1d SHA-1: 44bc6a421b496951e159abcd58eccb9843f79ce3 SHA-256: 921fb566807798e19dc03c12d917731ac20e9b5cfe9ef2141d70c983db67090a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=twin+cam+88+service+manual+pdf PDF link annotation
    • http://creative-format.com/upload/editor/files/35425794780.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6ff1231e1bd6e0cbd2613055129397eb/papidosos.pdfIn PDF document text
    • https://seikai.jp/free_images/files/55373257403.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a9caa24a---5000076243.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0098996fe08aeb7e31fe6a3c0cf07835/56126029827.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/jobijagixe.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i0oks011mhtnaohcp6g2vrcjlv/55570988419.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3b6cf029e5eeb76d38db432c4370bca6/mukamalarazo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea59cdbff---14914331304.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zafefozona.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/josusetameparu.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/45819428294.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/tikarekizek.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a118be671---96947289450.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/52734789178.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1389a05da1---98183912625.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/talikilusagagikatugivutor.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61d6749ee---79078404009.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/26256982195.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bufotaloweja.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703dc72b94a---25885727636.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/44446778529.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_off0000c1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 10984 bytes
SHA-256: 6598516dd008bd2d2b9e65417c8a0f10f13f256a896f8b1cd5e348c687c9caf3
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 16268 bytes
SHA-256: f0f5726e6a892eac4d974a85c33cdf8db39a695eabf8f71716330f9fa2796342
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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