Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026ccf7d429a41d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-09 07:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5d0c16282304ed773879d5d50d66ec1 SHA-1: bd4762386bd1c645919db8231db9567bc4d11a60 SHA-256: 4026ccf7d429a41db4a129e377e8395c43718b6f17265e7aa7ab7b053734dcc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sacoorhealth.pt/site/upload/file/katunomiloge.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae01ee2f91---66641111915.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26298fdb---59398367520.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/firavolikizusixesozaxux.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607153a742b56---23519320814.pdf
    • http://isystem.hu/ckfinder/userfiles/files/96892767651.pdf
    • http://zhengfutz.com/v15/Upload/file/20215241616486109.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/visi1d2ct443094fgf6df9jsg3/nugokopilepula.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/43536351642.pdf
    • http://bettaletroom.com/file_media/file_image/file/tezifa.pdf
    • http://accessiblevehicleservices.com/userfiles/file/reribadod.pdf
    • https://dm288.rs/slicice/file/59485449467.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e515986a17---58013767813.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/pikasedega.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/81c1be702c85a224910e93eb9ed2aa6c/marupigaxisegeredumoviv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77e9e5be0---78787386524.pdf
    • http://djapm.com/userfiles/file/mopofugugezobumen.pdf
    • https://abofahed.com/userfiles/file/70705738991.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887c9eabf---lebapowaketepuxobos.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6419bb68---jetojafogasanunofuxurov.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/vevaximodumone.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/10750535852.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/84a78a8912293d496c213a76508cda7d/jomimubemub.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fhe2447m3n7s6pst6absu33hcc/62664792751.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/at085ru57tjnj9vpdv9dq2ro7d/vimibasanesagilosupulom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=which+way+do+i+put+my+furnace+filter+in
    • 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_off0000e95c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 16792 bytes
font_01_sfnt_off0001016e.bin
89c19bb2eb884220ffa3563eaedae84d270be0b47f74fcc2a8cb6585e83eea30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 16900 bytes
font_02_sfnt_off00012da6.bin
9717e05977b1f46782508cc8a5cd08fa1b8987a91e1c4d4054bbf655ad93c40c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 11012 bytes