Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbce7b2ac653b94…

MALICIOUS

PDF

84.7 KB Created: 2021-08-24 04:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5967687903529dce2187b48bf0c2ade3 SHA-1: 886352157ddf2143c679b0e8f8428125985cd2a9 SHA-256: 4dbce7b2ac653b9494b89d117b3040dbd0b5ea8452b132655705369949c5af34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crysiq.ru/uplcv?utm_term=red+headed+cowbird PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98ac2b5c7---gikibepapud.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/motamamuze.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/17304775420.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fdca120c4ff35a7c081c0d7b197c5a00/97329667019.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b58687463---2007954628.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zixorawazomuvifefuzosaw.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161139dc51f446---tuzuzop.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakosozide.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/68693145654.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nemularo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42760096364.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/asvhp94347rr10o0shesjkufr2/merodejalagetuvixotum.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/64858820585.pdfIn PDF document text
    • http://tai-group.com/upload/files/29487918494.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f88f627784dcc037bb32de443eb5c69d/18186419608.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/banofovaravoguralevi.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/befugemivupifodigerawew.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/78707539842.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/59574106649.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce333561ef---mujugezimadumubegot.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/91664701638.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5aa8cda0f28ee269942c003ff81ddb7e/vusotekulapewatigefomu.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/38703015575.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/8204419039.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aaffd5e5b---nubema.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/48843179442.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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 10320 bytes
SHA-256: 6b89f4a57617cd7bf9f45a3e5d804762325062d11ea69ca3bbeb530810103ba6
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16420 bytes
SHA-256: 25a800bb241c951936e3f3f7e04a54061de3f11b9a1339f6b82044d53d1ef624
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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