Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55624b0465e4a79…

MALICIOUS

PDF

71.2 KB Created: 2021-06-19 10:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6238484929f1a3280264ce981eff90 SHA-1: 59c5ea5ce442278f7041177cd8c9368a70e9b5b5 SHA-256: e55624b0465e4a7917d7d6b15a0190b9d1a0ebec45be9765a09ea80efe734ae8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=how+to+convert+a+fraction+into+an+improper+fraction
    • http://thamdinhgiadaiquang.com/img/files/45452486041.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7e43aac4---79951368300.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8503c85af0---94985435908.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/98c465825fd96179e1b42a273c06d150/giwodile.pdf
    • http://visit-pune.com/userfiles/file/memirap.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1bca2fab---50770665309.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a01d5da7---dejagula.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/98b6127f1c1495ca128881e3c8d1daf5/fapoxomenim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076766943819---34299591759.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fccf84f459db51cacd705d6953138d4/misofogotiterimefij.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e79a26fd7708a06f725362ba78a55a4c/38372794843.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5ab0ae6a---zesezade.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a245c79b4dd---dobikamujilok.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/16je06nvehte1ri8qegk9ce9ls/54329074715.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ea3dc633---41478486582.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83a.bin
05b1722bb44ffb2702621602f195f5e5d65129b9513af142d4c35b7e27ce354c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 5064 bytes
font_01_sfnt_off0000e978.bin
c90c5466a0f6976c3be3100a2b62b0da38a227ea048120004a391bcc0e53b92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 10472 bytes

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