Malicious PDF — malware analysis report

Static analysis result for SHA-256 029dffd4b3acdac1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 12:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d230e746d3cda24be19788a71925e50f SHA-1: b3059cc36d88925f28acff1b3c380b0f26b2739d SHA-256: 029dffd4b3acdac15643cbba9b17c593162ceca2643c3ffe76a78e6c58fba218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised CMS uploads. The presence of external URIs and link farm heuristics suggests the document is intended to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=prevencion+de+riesgos+laborales+pdf+ecuador PDF link annotation
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b3907f39da211439772bb4d15208ae6d/27675577676.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpkup9t7m8gpp873rmt3q24pp4/31180338870.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/kirojameximolakefaxu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/39524787984.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/50840648325.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/gifoxixolugimuzolikir.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/mefuxabupujigumase.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vokamivomeja.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4e77f6b6---bunexizesodaxejujiw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2fdefd41de72adf84c78608e73108c9c/megunubenebufobojujena.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/7900284130.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/45a01ce109fa97f6a7fd7c93ce8d9356/69549115570.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/35199896869.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mn4t49v5vhnomnevnfgsrj8cjq/rugixinuriwonow.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/74415708991.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/kakabototiwefesevub.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/sixaretogumizuzajadonet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c1057088---gopategivafuri.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9542471778---54179570725.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/fixudipemebidutubag.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa60935dd5---vukux.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 19620 bytes
SHA-256: a970e5762c664a635499cc82fc9fa810c4895f90994023a0b635a5e2be0980c0
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 11004 bytes
SHA-256: 872831973846dadd4b0b84acdd9c7c3533d6b82557697d4aba2f84bd16aa8ef1

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