Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7a08ef6a934c33…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 20:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 451183a0eaf90031775e1c7b3039c5b6 SHA-1: 78b4a3d19cda217d6f80bb4e81ad99d3f54338eb SHA-256: 8e7a08ef6a934c33a07ebce3de1ac0bd2c47184137ddb95b8305a51884128bfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the PDF is part of a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc32ef35009---39646863584.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2bhk2737gp8helmvqnld20ijig/72071536822.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d1ae1203530e2b4f2edda518b74abf51/fosadijapuka.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/e5c754cace4eb557bdb68c7e9d7bb48c/39187246615.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d05ac325---65159897078.pdf
    • http://talleresjpg.es/img/file/65017809846.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abe7adbab---ropozivoribozakadoju.pdf
    • http://wxeina.com/userfiles/files/fezelubizopami.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8507615ea---lezunapemipakajilojup.pdf
    • http://daieimotors.com/js/upload/files/berevulawoposubijobeku.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844ea8d9d6---44876097580.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/sozosidowiraduse.pdf
    • http://konemara.hu/userfiles/file/sidokemomez.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d4fc022a7cb238ebb1ba40640a7ef234/nekedareluxunimodi.pdf
    • http://cz-synergy.cz/data/file/58376646128.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec05e298f5---34112300472.pdf
    • http://3qbuy.com/CKEdit/upload/files/lonufizitadu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2332a8b45---93328536166.pdf
    • http://chinasoftcore.com/userfiles/file///38937776126.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001b6908f7---febedirebifasovedanepusu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cfce23284af58ea1ba4eac49baa8221e/10029345616.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d423e8edb7e5af899b792edcfe39d076/12285070141.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/12a0e48aae7984083c72b3ab61391a70/35306677290.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/10e4bdb48ea51d97d32a4587175abc7c/77478793620.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+meaning+of+immigration
    • 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_off0000ede1.bin
62e9861a2ddf8631cb5473210c6a513dd85106834b650f77a5d64803677a3c71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 10412 bytes
font_01_sfnt_off00010543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
font_02_sfnt_off00011d55.bin
d7fdc8b817181d760bc1e8f4e4f3930620cff939247a44b1428efe80b3cc706b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 17640 bytes