Malicious PDF — malware analysis report

Static analysis result for SHA-256 de343442a6a8e693…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 00:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01fad8bda775fa812a80f406e63ed77c SHA-1: b9609b1e714b999fa2155b2ed40af3c1844ca6e2 SHA-256: de343442a6a8e6939c559f277596016c4de0b884cce4f71227c91a984f14e4b4
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, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the overall structure points to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=8+ball+pool+instant+rewards+free+coins+and+cash PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527cab0f41---paxokadakigugununizom.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/luzapidizogiguluni.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/mufipokorajuvupomevedin.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/73ca18e1b51cf0d9b661dd50a2e3a1d3/86786683783.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/vudafakadokupudib.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/38274289643.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b09c3ab6---dovologowew.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/69730041724.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/mowemirofakulorevad.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/timipiger.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/tivivuduvuruwuwidirovise.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5bb5cf31484959d757f018860f2758c8/vekugefelugovupum.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/39424479750.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/wolelilaludozeregexu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/mobonuwovutezuvawe.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/90999005946.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/3267548490.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/86897287667.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4516cf11---togojubixibomerajepevaku.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/54483931617.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e972d750---20030080125.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://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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 11052 bytes
SHA-256: 3242bd40509dead8d64730707dc7a8efe0f97dd94af1f4705bc9cd983aa2a11c
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 18520 bytes
SHA-256: 3147fe283f9e9f5983929af060b3fd08f923904893a78b57705f4768082ad8c2
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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