Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e7340f6253d178…

MALICIOUS

PDF

80.0 KB Created: 2021-07-06 15:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ffa5f78bea8fc3aff511873dd8865b1 SHA-1: daed58cabf37bc0e46eec79cf7dc266a4656efb7 SHA-256: 95e7340f6253d17897a01ef843f49501e918dbb243f4ef291f2f2cd0eab943e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDFs. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c98159cc---wibotesagep.pdf
    • https://paperland.bg/uploads/file/jifili.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c732fa4945---lunapojudirikavexowuj.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73dcc4060---27970371284.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/womowosubonipefi.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b5332e16501399643be930ccce4fff80/jomidelirib.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59ca1274e---niwedab.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160727b11bc5bf---kigeroz.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9ed511a213410b83c55d3becb70f8f4b/10676093104.pdf
    • https://peterdegendt.be/file/93115812819.pdf
    • http://writtenmail.com/upload_images/file/zamatokagonibedariwozoma.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d1e099a76f7e2726803ad0a1592a9447/41151412995.pdf
    • http://baloneacessorios.com/_upload/file///66836696121.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vdq113q7i00iga24nphdj3kjt1/damitenatagelololirolomin.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4bbbnid5jd8gaoq9cocbf9ik81/rixubuxove.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49213bc71---65644231930.pdf
    • http://bagiez.com/userfiles/file/nowewujogurijafapa.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a5f3512cb55308186d32adb6bb138d08/vodagerosemenamilezozaro.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4996df5849e0c2d3391dafac99864669/27485823359.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60BFD20FA2A18.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k4vm6uott9jpso92o25mf5fquj/loxarol.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/91126619591.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d57fdf094---lasasiwibidiwemiso.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e5285147---wafugol.pdf
    • https://austarpharma.com/upload/files/3685318321.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=population+genetics+lecture+notes
    • 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_off0000d621.bin
7364b65db96377ab609f1d2d95fa957293dd107c667b6bf8a67d75a161e2ae5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16592 bytes
font_01_sfnt_off0001015a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 16792 bytes
font_02_sfnt_off00011971.bin
25ff5308c470e211a4c95241a75d68aa193e731f643aefe3155ed2571fa13404
pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 10652 bytes