Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb4cd2ec12d0a85…

MALICIOUS

PDF

78.3 KB Created: 2021-08-14 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05dcca8c2db393714e838762beab4dd2 SHA-1: c3af21bdc2309bc5ab5ca63228328eb29fe4cd48 SHA-256: afb4cd2ec12d0a850d776d024a97625dc56fe08c2347f8fcd01c7e4e0e3fa49c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://activepymes.com/pub/file/86654245458.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8e8fd8075ee7d87f884bc4ebff332ad9/44370043119.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/vosugamif.pdfIn PDF document text
    • http://anpo.vn/upload/files/komukorurafe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nogogupu.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pirulaxuxidumugepitot.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/guditedagumumazeke.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/kilerarufi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ac481615e00---fovijiraxejamukofunuvuwad.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/61461928150.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fea8a097117ca66792f968c3cdab6393/23018411284.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/16435795832.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jugakatux.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/99416819391.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jaresulazefanoxin.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/23924483378.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabbe29a92---dobudasiguza.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/zenasawopusumunifojun.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/21268598560.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2ebd07d87f0ef97f024488427182c518/88750133783.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86889994011.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/marasalamejesinumumavoro.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/324e13c295bd666f56db717230eaea19/37738381183.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/80675653726.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/83652570964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=zubeen+all+assamese+mp3+songPDF link annotation
    • 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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 10680 bytes
SHA-256: add948a7c927f156c3e4b6aa31cad49089c1fe2a1efece976b95d736dcd1b46c
font_01_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 17316 bytes
SHA-256: aef5229c300bbb6f892e82ddd8dd6b7de43a2639cb964a7ec5f343618c2748e2
font_02_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1