Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16fb31c20c00a1e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 02:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 264b954563b3e93b080a37062c752847 SHA-1: c4459f104f4b28123e94342aa7821d43af7b5c27 SHA-256: d16fb31c20c00a1e5b977cb2a8ba1fdf21eaa5c4f798e5e5af47c5479d38c743
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking an embedded URI. Multiple heuristics point to the use of link farms hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of embedded URIs and the overall structure strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=ccna+routing+and+switching+pdf+2020 PDF link annotation
    • http://emekyesiltepe.net/images_upload/files/11206896542.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/52952512682.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8fe4181ef1576ed10f855c179d5473b3/popibamigazukaremivukanu.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/30564182640.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16144f810acb56---suwarukokexexa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4996f403085d1a08196b69a45f4b3757/wopetugudixeluju.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/77854685070.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e469647f---nufurixexegifozosid.pdfIn PDF document text
    • http://camonetinternational.com/files/file/rosazifigosakamaka.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/57143068514.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/20166185938.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/72206402981.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e651fb12---97837987774.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/17964430568.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/96046779685.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/jujetimuxogivegojezivol.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sixesakitudamezozutibunu.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81208836072.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vebimavemumojifosevin.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/jijib.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/mijorabapizimed.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zugoniwel.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/53033650090.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xipuvutanedeniwolofivubo.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 11180 bytes
SHA-256: b65e3325851a83f422142ab3f1cfef19c575a757b3f6c26a28e3c704ed57c0a8
font_01_sfnt_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 14552 bytes
SHA-256: 85f3f5818dd3f45e857b5fc0de4988351f472f61a86773ad3827e2995c08e4f5

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