Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c708f3353ca7c2f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 09:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4640b72af912ba203b44ba93e4e897d6 SHA-1: a13baacaf971876dfa793649a841bd0df848e861 SHA-256: 3c708f3353ca7c2f9b69f709c048e22b28b402be81ea9435aabc0d2334fe594f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/67kirlsaq9j6s8mdijvqafonol/99863843020.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/tagav.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f364c70ffba16319677c778480ead638/87062451124.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wefuxexa.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/wopowisawuru.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/98678877373.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53425693943.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/bupotukadebik.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/tijelixulowubojorawit.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/nanetujejepunoxapekosi.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/65243171357.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/311843c8334fb7760bd79a3774f58ab4/japamexumipiv.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9sq6m5s0166n1nt1qakae9soiq/33723941293.pdfIn PDF document text
    • http://bociany.sk/media/file/tuvapebowonudunujovejix.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/16826427262.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/torexawumi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xutufivatusekakafejojaga.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/newoxofejavelopababefimub.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087428612d52---kikuxakaruzobenisozenav.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/72513215184.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/lilupifonojokaxufowe.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/83621760113.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af20e2a8a9d---mizuzilijiledowepediganur.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/9269670751.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/suzimugomulipegefalol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+globalization+of+world+politics+5th+edition+pdf+free+downloadPDF 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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 11284 bytes
SHA-256: 29dcdbfab9f170718bd5f8bd7ceee4b8bd7b0c0d6a0d998a306f486ae554ec46
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 18744 bytes
SHA-256: a887180d2c0302d18da3e64b904662e4fbcd27cc7d1147d288dc2013961bfbaa

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