Malicious PDF — malware analysis report

Static analysis result for SHA-256 d741de1d0f96e9a0…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 14:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 785f44cd4f2149bfea4596bbe162a103 SHA-1: 298ab87b79c28a3df4a11f0c7a80452944d9eda7 SHA-256: d741de1d0f96e9a0442d6c5bebdf7716497953ea5cd5551d731dc309e0da8fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/26c7487b65d0bdb81227d34c8603e917/56924860652.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b24a27d---degopabo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21c4a24c8---kawuk.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1d7221a2---76559358442.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6926c6b7d4---6443384188.pdf
    • https://tedvandergulik.nl/userimages/file/15859719020.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a467348c53a---77679870914.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6252af2e5---jigakusoxejejeman.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/72ef7d0e3ec23905c5321f814fddf5b4/90727608079.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2df6e292f6df96d5bb257f3d82bedc18/zikelirazosuleba.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3f607ee4966ac0e6ebe9de576a952dc5/79602393130.pdf
    • http://bpsstudio.hu/uploads/bezenakujokaviru.pdf
    • https://artlabjo.com/userfiles/file/9015320912.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6e08ab1e---bijesaweludimeni.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/de6df3549f60aa284aa2ade7710cf3a9/genedilarezuvubavoli.pdf
    • https://pet-fashion.ro/mm/file/30721837192.pdf
    • https://asiarsolutions.com/userfiles/file/46829431794.pdf
    • https://greenfuturevietnam.com/Upload/files/dasep.pdf
    • https://rajakeempat.com/contents//files/jenavimu.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/61af6bto9ikk2eeednimiq8dn6/joxuzuvuzodaxamibutopuxi.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073acd174733---27233991623.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607395a1b9a2c---55337143146.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/94baedc94d1f568bacf5d1d60b34fc6b/gujobubufaniderogilutek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=research+skills+for+students+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f4.bin
c10fe30484159eabb88972ed683b4d53bba405e36600edd0d2e36717c4ef50c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 10952 bytes
font_01_sfnt_off00011c53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 16792 bytes
font_02_sfnt_off00013465.bin
b27fa9a50a3155101461c46471f3b3e38a771e43551ab491735316809720f912
pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 17872 bytes