Malicious PDF — malware analysis report

Static analysis result for SHA-256 449e64e04673cbee…

MALICIOUS

PDF

81.6 KB Created: 2021-07-05 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f8762215ca41151cf118dbd917f583df SHA-1: d77a62929268a17337634fe8bc9ca9f69af03390 SHA-256: 449e64e04673cbee703c2996223b2aeb2f8835a16a04b34f8c3330d6e67f51f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=life+in+the+uk+test+pdf+download PDF link annotation
    • http://jrpst.pl/userfiles/file/vewujova.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c02c92028---wepawozurolak.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/94304052382.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6tt5lo4866k9akmhrvssmq2bt5/nikirolediwopinugavu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/92992659606.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f58dd5407eceec826f5032867f4064d1/kobozisugobo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1fbd039a---vanomawepike.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/559ac121c6b7a1d903f14c62d9dd47a0/pirowunadexajowoxi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815a7c7eb81---9165596267.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210623045707825.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/rirafifurezozisukeba.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41783b599---fokuvipu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/zoramajelusolekoxurepub.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6d77f6223d3372cd4d78eb99bca7cb76/nareti.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/34988279037.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c386a498---xibubadini.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/gufasujo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fezog.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/74269527160.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4abdaf7ed1474f0d4b76db8e06afcca6/70117363610.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/46688492636.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d024b86f0ffbd66cbc0a2b79cfc9525c/33697299346.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/30889703534.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/27900308988.pdfIn PDF document text
    • 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://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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 17108 bytes
SHA-256: 126f99bdae992fdba7dd8c4d02ca1bff7e193d6b7d3844586d8f7ca9c26e8e62
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 10732 bytes
SHA-256: 0502bd634b3aec5f80a0723130b413008db562d19b5b44ebb67500ec08026d38
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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