Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9e9b85d037c3e9…

MALICIOUS

PDF

66.6 KB Created: 2021-06-20 03:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af0a5d3c77b04162d3c169b03ecbec33 SHA-1: aff862ae46c01dbb2db4caf3f082b6043432a214 SHA-256: 1f9e9b85d037c3e9483d9e9a73b6c73c8d5c66515a1507bf21b7f0d198c7d8b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme disguised as a file converter. The presence of a 'download' button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1ddc71e2a5364b95bef8dfbf360e7a95/94809540542.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8f08b7bd0dbda7dfd423da4f3262c4c/22497335835.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf213b99a1---81333931243.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed16616a6a---34942673040.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c7ul37vtmv2h3ialnc86upntjf/90271905153.pdf
    • http://altinay-law.com/images/file/lewexajeputulum.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cab7c759c---lekazo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f53aab9a---vugokafafonerefupun.pdf
    • https://pharma-tools.eu/galeria/file/88298371988.pdf
    • http://sdds.be/userfiles/file/50631220116.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751bc9aadb---tasovifipixiwajojemiwa.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160abba684c989---76953729161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=100+kb+converter+pdf
    • 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_off0000c88c.bin
54f5e85db55d1c574fcecaf46228fbf93a95985f8983c94891da5570c0c64dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 5092 bytes
font_01_sfnt_off0000d9fa.bin
e26ad815e8daf5937ad28dba235142cbc0de542e3732d1200f209ae064c6c66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 10648 bytes

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