Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a45fae06a96414a…

MALICIOUS

PDF

103.1 KB Created: 2021-08-08 05:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e841e5fd467b6b5c510ea1b3a3f26a0 SHA-1: d9bddb62b499599a20e10453835fb80e71cfb3c4 SHA-256: 5a45fae06a96414a5851871caf2df7d0ee4dbe66e87499220f4b6385bb0facc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and disposable hosting patterns suggests an effort to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/07qaos5b7ujs2mdjndte4rop4u/68872296245.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e0e5c2d9d---zotasudipo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f0f89191ef31126c5b8bf04939286e63/52999508890.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c16a3a0c---jefuxexubozokepalabate.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e1864f72---miribadojaxorijokubo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/11786179908.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/64027829014.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/33329847862.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078434348b96---26329243788.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ee370666b46a243ca7919a5b0962315a/17860564440.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a864ded38c3---wegovasiwosovipiwezigije.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4cdf55836cff765d612546e42d184049/lanobixelavurokos.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210726_5C82FE5ADEF5AE7B.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3c44205af88b1447aab3282b993fe0a/54586814179.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/42130cd5a2c4ebe9f6e287b0799c15ff/jikujura.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcebc29f4b0---vubidosomafaju.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/51971547503.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5a053721---96154277422.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e607b70a2e00447d8037d5bf29da47b4/32298248207.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/46211759794.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/460f1fdb11565f633711e806e1fa293d/37931949914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+world+record+for+pressing+the+spacebarPDF 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_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 11120 bytes
SHA-256: 6a8acd9e849f2bb97151e547fc25b4c3ad5361320f60878e6e2e481bc19eec88
font_01_sfnt_off000141b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B8 19688 bytes
SHA-256: 43a2583ba2eb4ebd4377788223921b1064767fb3cb7f834e6610f689d78fdcb1
font_02_sfnt_off00017441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1