Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc31ecc9b881b4d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-24 12:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 247c127ca01976b9ae8eb10bd199d8e6 SHA-1: 3d6d89cce85c661238d72f6ce44916f0cde53b84 SHA-256: 9fc31ecc9b881b4dcf147cb09000bfebeca826b83c50b065860204ec0042e571
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, with several URLs pointing to compromised CMS uploads. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The primary function appears to be redirecting users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=transformers+forged+to+fight+game+download PDF link annotation
    • http://hotelbasantresidency.com/uploads/jikufumod.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/10226188726.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9fvdot22uqce9j5l5pg4vblus/58705744781.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/93359912303.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/66746844198.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c570a3542c257c4a0765d3ccdcf45491/nizuxutiguwul.pdfIn PDF document text
    • http://snft.ro/media/file/12572975855.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/mazexufojapixajiwa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da302dbc8a---92504743990.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/25148341457.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/66815381397.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36664929165.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/naxuse.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/wasorufivigu.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/mevisiwire.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613460b031b06---tibewa.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/bikekukagisitubaliz.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bepifobikuzapisep.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/epc93a91a5aatg393vnu99heac/wuvupewalu.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_off0000bb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 21000 bytes
SHA-256: 73263220218d73bf5abe0a6c9744ecb11482e5a72b399b297e5239ae183cc899
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10852 bytes
SHA-256: 1e83160ffcc98cf27be83004c6d7ea71bc6cdf1fe739222981c6086115554a0e