Malicious PDF — malware analysis report

Static analysis result for SHA-256 932c1b1e7e9ac977…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 16:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e31968b6f4ad593e7ab523c935ca73eb SHA-1: 4109cdf30768d8a403f19bcb1f4db914ae1e4661 SHA-256: 932c1b1e7e9ac9775a8efbc2ffe2cef6d1d83f870f7ce5c6adc2b368634a593d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. The embedded URLs, such as http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/494c80cbabbe4ed18fdb22a8e2fa30a2/6863081196.pdf, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d74f9f6199ddd987c8d96ff30d0349d7/ramitenasafole.pdf
    • https://chmelo.hu/sites/default/files/file/49014202599.pdf
    • http://turagent007.ru/userfiles/file/tezajijuso.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/494c80cbabbe4ed18fdb22a8e2fa30a2/6863081196.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3766bb1e---womofidinovukuwaxaru.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ed7f5dc553553827ffda4c31d63bf3fb/gowudabirinowe.pdf
    • http://omatsuri.kr/data/userfiles/files/diwewewizilegizimaj.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bcfc34dff834d376816edc5968f34f48/67337155906.pdf
    • http://rdmsrl.it/userfiles/files/tegizijuzapatomotopewutab.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/74nqh3dobfcf8lfg98c9r01177/gasuwituluxokepuzoxu.pdf
    • http://ascensionchina.com/userfiles/file/15938484996.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f361d389fc---xujulog.pdf
    • https://netwindowvn.com/uploads/userfiles/file/38573828050.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d4a4eab32454229851cf15eb8d245075/sirimudaka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=constituent+assembly+debates+book+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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec4.bin
682d29291ec864a071396bc86bf0f30c4abf42fe1f15d9a8644eea40479154d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 18308 bytes
font_01_sfnt_off00010e25.bin
2cbb1d12201d40d28e2b4ae7420daf798f91c038ff7c52206102d33ad9f5769a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 11036 bytes
font_02_sfnt_off000127ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes

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