Malicious PDF — malware analysis report

Static analysis result for SHA-256 9180a489ba62ecd1…

MALICIOUS

PDF

89.3 KB Created: 2021-08-07 10:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28589a45c0b9ce377499b8994a052fc7 SHA-1: 27917224c43588882048c41fac3334ac105ba6d5 SHA-256: 9180a489ba62ecd15c2df166d43129b6fd88ecfd634366cf3325f4e607a843ff
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on compromised CMS upload storage or disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tcihk.com/userfiles/tolapixiwotafi.pdf In PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/33956961451.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210621151727.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/pelofasigosawu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/22496697892.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/duguvagixasovukubumipaji.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hootvfntr83sfnieto41ocjhvb/98166270422.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee16260ee3---66331409008.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f442ec84e14529f73a52368a51d0f3d5/20377363795.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pozixejojajijisedetew.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d347ddad04---panivimitas.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/32743162319.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe345d6fd22---tigoja.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/dupibokelisavuf.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/73878920409.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xufanejefewibexavafobi.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/11931268824.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/lupiba.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wegovulobuviwetofa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb4a75ead---39040718902.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/novikifiliriruwoke.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/22708752359.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862dea3af87---4527107882.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tisaropulad.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077356da0827---nifapixakiwavasexiwogikat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=skyrim+exit+bleak+falls+barrowPDF 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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10880 bytes
SHA-256: 315d137cafd8e4bd663e0e0f0b4f8442dfa80da5c7a0d4e01cee3171b5237e08
font_01_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 17084 bytes
SHA-256: bc91b6aea3adf1c9281274f69082716cf16ab7a8f67126804ae48729bf0d47ce
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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