Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfefef09077f3047…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 00:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b919d05edc1b1e23b08bc0cf1e339982 SHA-1: a1469da23aebbab53ce94d8b5fbf862c68fce08f SHA-256: cfefef09077f30470ddb6a8a7ea349e027bd002a4f02930922873dd7d961673b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

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 https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d23e8f8bef9bec93292e72249e2b7fba/92125522862.pdf
    • https://universal4shipping.net/userfiles/file/vutakujaneviraw.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/144e04462e5dd2a658cade1c9270ea82/regud.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22mrlabftij0mm5dr93kqrbbs2/nopajavopu.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7ebadc257b91523232361da7a5fa2231/25107868171.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfba3edb2---kikegelabusa.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7jq7b2fkrghqmjusc9071insrl/52983835183.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4e68ba4c---gepabixasojemim.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c821b5936b5ace80ec05b30cb552096c/norinipazefok.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d777b0691be---65269483563.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/82188599618.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17c033bfe1e6e0f784291f0723e5b27a/53342181289.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d884a335---zewudujaro.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2e9b5809---wexewimunexevupisir.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738a13b4a78---74904543525.pdf
    • https://istanajpdua.com/contents//files/kajinizuvirobosidepi.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863007a6006---nuwuroxipidilux.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160828e635d42e---danexepe.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/389548734a8621a45452649a08cb46b2/19341328264.pdf
    • http://focostrade.com/files/20210624225411.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ruge62f8qq5htnj64m8ojqpsb2/zekavugajelovasixuvi.pdf
    • http://jrmhandling.nl/upload/file/gotugutosadatuzupepifab.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c029d867---sovelababejesonox.pdf
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/97635550335.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=snaptube+android+4.0
    • 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_off0000ec3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
font_01_sfnt_off00010452.bin
46e97a5e9d6cab6900568d33b9f13d7f726604abde282ac70408f2dd107223b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10752 bytes
font_02_sfnt_off00011cec.bin
1e35e84cf6993fe4d2df54872fa0314b416ffcaaf010670bceed8094f9dbe5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 16884 bytes

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