Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c93540d6da5ba…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 15:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbfcd22a2da6c09a443b763569ff3aa2 SHA-1: 85e0ecc0aadcbae5206e4fbd21440f9cb1868d9c SHA-256: ba5c93540d6da5babd1b5f4278d075563cde78ada534bf560f665529786804ca
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, containing a link farm. Several heuristics indicate the PDF is designed to host numerous links pointing to various domains, some of which are compromised CMS uploads or disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://paillasse.hu/userfiles/file/79245082968.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/miravisofusobinibewawur.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/53259034118.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xepiluwifesidujizidixixoj.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/57231894726.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tabikudeluzami.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/70950911729.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/78171657288.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/ximoxofavidemotijup.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/xutegelebekewigobezoj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae1bac315---sovib.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sufed.pdfIn PDF document text
    • https://rinducm1.com/contents/files/mawasenufotebi.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/28786496258.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/wuposite.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbe2b770e---tizewadaga.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/fokipujuxakamob.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kituxemolifa.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/fomoramefoxixakolu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/50911309e4ece88981cdcfc051ec8d0c/ganogi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b83228e6---pogukexifisufadiv.pdfIn PDF document text
    • http://jljemc.com/upload/files/57102606084.pdfIn PDF document text
    • http://mcutech.net/files/42975280625.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/nurilovod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=anatomy+for+3d+artists+pdfPDF link annotation
    • 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_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 21772 bytes
SHA-256: c5c2b95849947a59a30dbd73f11191e4691377c1b9ce6d2baa35d13e8e6e255a
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10748 bytes
SHA-256: bc31e2761122a7749841035c1eaeadce8a75660c9fbbb4bbf78ba2c20bde03c8

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