Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecf92e05e87963b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 21:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c624a68c889c88665a4cf5b7681e7eaa SHA-1: 7c0bc8ee37352924cd2fbd0e2a8d09e419bfe435 SHA-256: 8ecf92e05e87963b2f8c6eeed5d179cfe1b1a0246b142afd480a2a90f968a4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and serve other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=apk+here+five+nights+at+freddy%27s+3 PDF link annotation
    • http://tuderprogettazione.it/userfiles/files/wivazu.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/mibevidagamu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/73c39608b228c2e93da05ea9ab9618b1/9803683981.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109250907232600.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c7e6ea14---97696391448.pdfIn PDF document text
    • https://insp.biz/img/file/78219219698.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e68182b204---26291964710.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/43053333804.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/98599364401.pdfIn PDF document text
    • https://buka.ru/sadm_files/8077345872.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/jovejidok.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/15445807274.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/xaluzogikoz.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wesav.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ace44f64385827d0555c81ebd4e2e660/40993007124.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/25950910809.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4706707528.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e854385f39---besegepifikexojaru.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151139b5233b---wagiriwupudogodorepogased.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/21961429739.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/37583717377.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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 17576 bytes
SHA-256: 7c6c7f57f347c16d9ec7cbef5a46e46c66028111516094d523c06eff1e0a1822
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 11072 bytes
SHA-256: 715d495011340bc9cdd97ca7aa032d5adbc196525ad3a77bf8e7c9f484436962