Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a6434abc336f65…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 04:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f78f593469b642a3accdfa2e0e5613eb SHA-1: d1c6d8486c5011a6c6454e744b63b21b3a34ddf3 SHA-256: 27a6434abc336f6592ee868f518f657b40ab806c776e15d5af045187cbcb0e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://euroambulans.pl/userfiles/file/pelovokikalefofefaf.pdf
    • http://magnumprint.ru/upload/files/kugokadevubapu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372cb0c9d6f---nexafejunofubajewobotaw.pdf
    • http://www.polni.si/Images/files/43115579392.pdf
    • http://studiostocchi.eu/userfiles/files/sodokexoxuwuri.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c51c29a---nesozetakofafe.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vajezedupudovibusekaf.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/58794730462.pdf
    • http://ufnk.fr/app/webroot/files/file/84892736761.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/kisusifedetumiwomavukumix.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/78d2084071258248c1d5a65bf4e2125b/14525266917.pdf
    • http://rc-modeller.se/images/file///zomekabidulogiwakigu.pdf
    • http://biurod9.pl/public/userfiles/file/91323023630.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/32554463120.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d1ea44a1---fuwulexajojekufex.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613074edb8fb3---15763206221.pdf
    • http://hoaphathotel.com/luutru/files/detekifovewag.pdf
    • https://mimpiindahsatu.com/contents/files/kuwaletemerupaxotaririb.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/78ae084a5c2d7dd9e10087678ac1c6a5/52146689886.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/sofokaf.pdf
    • http://aldo-ins.com/userfiles/file/pifowi.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/bomebitivuw.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/vibakunogox.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/67316971598.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=star+wars+rivals+apk
    • 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_off0000dc0c.bin
880915d0d28717d424742b43d1408140008a4359ed663d064d2b38f2aa6c024d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10208 bytes
font_01_sfnt_off0000f30f.bin
0f407d7f968ff989d564bd6242aa0a8d72c7be775bd4c0b66d6a6f401b631e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 18432 bytes
font_02_sfnt_off00012294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes