Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7e3d73d4bb9c98…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 13:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a47333a2577b73bd0b1727e640a775ec SHA-1: ceea83f47225242d96dd5a42b87756ec387e5213 SHA-256: 2b7e3d73d4bb9c98524a6e665c31f1de38493b408abeca3fc8de7aa45eb152f3
176 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 are hosted on compromised CMS upload directories or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure as a link farm, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://adaviestransportltd.com/userfiles/file/detubafaranurulas.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/poximixitegefovekezutova.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b978fca9---43000463886.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d20feec6b72---sunakesafupalugipobimu.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/otimeuop5nku38quaiuh5229im/15219549510.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a522e028f57---93109942385.pdf
    • https://markmont.eu/editor_uploads/system/files/bejikujuviniweze.pdf
    • http://skkl.cn/filespath/files/20210825175127.pdf
    • http://skene.es/userfiles/file/moxujovuni.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bb766f00d4185d40fb49e66d3fdfe683/38094946123.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df6a9b08d3c5c94166d47e56ba9f8fb1/18958984678.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b9328fb844ff1f9f99770fa18bdc1f72/lobadarodigenuwuxes.pdf
    • https://jetaime-shop.com/files/noririrupidenir.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/63010252736.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/raxumivoxeleninupuru.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/450e041f93d19a3da337451a44b8a1d9/nopufawavo.pdf
    • https://nguoixunghekiev.vn/userfiles/file/damesigi.pdf
    • http://law885995.com/upload/fckimages/file/33653934838.pdf
    • http://brbud.pl/userfiles/file/16465359818.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/gotofukijikuxibogixur.pdf
    • http://rgn2u.com/userfiles/files/51133683431.pdf
    • https://dpt-mh.com/uploads/news/files/xaxufo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=laporan+karya+inovatif+pdf
    • 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://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_off00010e57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
font_01_sfnt_off00012669.bin
8c5f09c289146dc1e5f686594a91154459c338609ba6854066f9581c06a4bb68
pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 18560 bytes
font_02_sfnt_off00015649.bin
f13d997752c6e16077ddd0ea85ee751ae95af2ed7c1c16d5b977caba96bb39ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x15649 10372 bytes