Malicious PDF — malware analysis report

Static analysis result for SHA-256 8593553b7e2ee850…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 02:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12617e5989a6d883e22c3cc34443920d SHA-1: 9cd98a85782d7c12e93831c5bd6b4e8153a4fd69 SHA-256: 8593553b7e2ee8500fac1d80211eb4cccf6c028ae2e99263150c3c015f25dcbb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe29e1d6d0---kasotu.pdf
    • http://washchienluoc.com/upload/file/tobajom.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5ff3bcd5---80730471092.pdf
    • https://plentis.eu/ckfinder/userfiles/files/24586155971.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a3ee8b1918371f8b22e4c3065edcf8d7/raminigegapibedadune.pdf
    • http://mini-garden.ru/userfiles/file/kibiludizofubutis.pdf
    • http://herve-coiffure.ci/files/2274131626.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b519c526e40---88314312410.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/302e2224a8f10b78116376f6def255e5/wigefurel.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6cfb2036c20fa431655d0e9028bed5fb/xifowofirewesi.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/27e228f201820b58fb5cfd7120c3a9e8/sazafugus.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/38e0b1076b82850b179e46863f1b1d6b/gekodegedizeza.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071dcc1bb205---364215885.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3avesngho8hcqqtftd0efs85j7/pokakukokawilulexo.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/14348153613.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05bcfa2cd03ac63bdaf68f881e8b5cf1/zasivurevuxeluzax.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9b084839---bipobimebabuzivufexe.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/nikozogizufuraw.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a82781c6afb---pimobovimuromevasamake.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nrk54psvp44fhbtgr0dhvvva35/14854728365.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/1puldi5uo9dsap83p1pgjmiv80/28349291523.pdf
    • http://pk.mo/userfiles/file/dupaf.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2ac8bc44---83351947191.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=view+old+instagram+messages
    • 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_off0000f796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
font_01_sfnt_off00010fa8.bin
823bb8f45b39cadc2a382fa48ad91c978fa79096660f92c587cfcbf078c97d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 17244 bytes
font_02_sfnt_off00013cb2.bin
d58568d85deacd0762fe8b088888f1f2b312eba084525d42d42c3fe7313e8e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 10648 bytes

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