Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d575088b9a84b…

MALICIOUS

PDF

74.6 KB Created: 2021-06-16 09:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 67bf06595d7f26166b81ba0f61fb0a55 SHA-1: bebc9aa4e5c26c7a359e587d71878e42ed69293d SHA-256: 998d575088b9a84bccf8bbc4ed706c0f713c178d4abe3d2a6e1b84046231784b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=gamecube+mario+kart+rom PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720b10a214f---lowiziniwasafupol.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f5e156e05b7658d95c1312f24ccf3508/golofadigavasag.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3ac9692d64510a128c5e1b7aff865cf0/56201009354.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab7a4ffa---jimuwakisanewodifozaje.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/58681747552.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbade4bfa0a---32309748207.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/91153438532.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5kv7r6qqo5dlp4focr6mfa8v7d/togikilaxe.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69a7e61b7---takuwivivafoze.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92510724455.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bd0c81b4460809e8b23067f0f432695d/vesizegozolapogoxesov.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/94535623761.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b134df7a4bd---dolagud.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/guwogonukuvajala.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501032614176.pdfIn PDF document text
    • http://vtaky.sk/media/file/51850914157.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/22f274bb1f4f170db0b9fee808969f69/1302146795.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/87569438711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 4972 bytes
SHA-256: fe58b9d355276a31a0199dd43c771f1f303a4958bb274de4d0e3f49c32996188
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10280 bytes
SHA-256: 5edfc7c6cc265245664293df3b0dee4b855a35b909a154715558fc2276e31bc0