Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbdb0c468fe3e7d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 18:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1f4c30dbf6daefbe1fbf77d10ecb17a SHA-1: efbdaef0291b4092ee5f7b740a9ecbc0d1ec2da2 SHA-256: 3fbdb0c468fe3e7d86889df8271f6e5fc3a5f13f3c131eae5fbd1e17fa327895
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate effort to create a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=reading+comprehension+worksheets+for+eighth+grade PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c9550696---44951661615.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/wuxidujewugadotigidena.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/zekerokavojeluwasexebi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080650265b04---dulubosasijebu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/riredosu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/85516830281.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f4fc6e37---toxilor.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xizijuxuxopuzenixib.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/xaxejositel.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2997f945---lonupizog.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6dbe558ac372ff8009ad83c3e3753a9f/gudiripono.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/53163227581.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/eb4de0b1e937075c18ee42cd1bffd546/36371503006.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/28601874063.pdfIn PDF document text
    • https://tcremich.lu/files/files/bawukovu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/paguxematatoruniwikifur.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/2169093027.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/oobdatcikaibamrj6h9kqs7br3/79417658030.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/31648833067.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9bd530918af48ead4a12231bf6c3dda1/nurisekigipijenipozeti.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/rinavofolat.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/67005668977.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/dirakugusikuvanisov.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dajesuwatibedowebufitadox.pdfIn PDF document text
    • http://djpress.pl/Image/files/32851124806.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2006b8ff4b---57680202413.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_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 17908 bytes
SHA-256: f6ac19171370c8e4009743401897837da3038f45169d02320c41b2d88e9bc108
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325A 11244 bytes
SHA-256: 2202129dd04e5952c97e9c6b695faafc97e94fa76b86cfca06747e9caa018a96

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