Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a74bc987b95d9e3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 21:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: e0244ef566e607c401460abf4e00545d SHA-1: da84fcd9f8eb72c7e2eba7d85df587c96d965dd9 SHA-256: 1a74bc987b95d9e326018acd46e3572b96068b3c97b86d0eadbcc825301c10c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://imbirimbir.ru/files/zegaxivaliwajusupot.pdf In PDF document text
    • http://www.cottagegrad.ru/files/file/jidapozemubemutoj.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/borisuladuzogazifefo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/38649108034.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/42413335151.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7d938d9118fcf17d8b868ab63fed6e31/50033364909.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/fodudobovowaxafu.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/ragalarisokiliji.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bb51c8a---26601955666.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5b5785b---vebanapijavonuxufumo.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/bigijeniwake.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c432057e6d7cc95511151e680d0deadd/64799607071.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p8ieq7b11a68oigvt3clnopdre/28751615814.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/42389646298.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210905105622.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/67249974871.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wisinekibe.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xanabofik.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/wovagobek.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/xevidinokuvujasaravezagu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/dumutenunemipiwavubeb.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/110abac75adf30e80fe61b8360ee41d9/55740878546.pdfIn PDF document text
    • https://italvaping.com/file/wipudepet.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/86324452fa386356db0665b8851e11ae/munul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=car+parking+multiplayer+mod+apk+iosPDF link annotation
    • 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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 11072 bytes
SHA-256: cfbb8a7de78781cfc5661b755c2a6c9b8d09229a1b3829e56f70170ec84feaee
font_02_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 17228 bytes
SHA-256: 53a2992268c7654df64d13886eec2b4684150f0a77573b78be275e24e2ae7dcb

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