Malicious PDF — malware analysis report

Static analysis result for SHA-256 c825bd3c8def56a1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 17:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a193bbe21969168d0422f1bc42cac887 SHA-1: 6f34e94a12d6cab907780c07c225dae7016ffe12 SHA-256: c825bd3c8def56a10b28ceaef6fccff16f3ad6fe182de998a42d8578d2474d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an intent to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=varzish+sport+live+stream PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/44349634719.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/77723387560.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/4795712892.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/14995795723.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/bufopisodanux.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/81453807379.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/9227664889.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/fupebegefagevi.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/18058881150.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395274cd5c6---31130571486.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/sorekixine.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/43628583405.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161429684aa2ab---63447963184.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145485eb0b93---gofobokalovepag.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ea47c7c1876935fdfd85fe593ecdfe2f/kemerofetijutetovasata.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/62765853350.pdfIn PDF document text
    • http://jarosi.hu/files/file/boduzapovexa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/72d19af06b1f9c53cff68b31c3365d28/vosixokilodugekujo.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/vowigajivelekape.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/darigimoruw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1b09d5b5---8168834568.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/8428286763.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/92378130845.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39463913170.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/98946174491.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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 10508 bytes
SHA-256: 0a21f4d01665d5905eaa687a02ca5ccaf7e95c3b7eb635a44b40b1a27fc5944b
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17476 bytes
SHA-256: dcff8182ad4760ccd054a990e8599671902e568646b6c34c52716be0ab68b1c1
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1