Malicious PDF — malware analysis report

Static analysis result for SHA-256 5873a25a1c4f1c16…

MALICIOUS

PDF

91.9 KB Created: 2021-07-18 19:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7adbc14e71b2f93d4904afa2c526dd2 SHA-1: 34c6c6962fef57e6c7c01a78167a5377673ccbd3 SHA-256: 5873a25a1c4f1c1626213f99523b1e95bf1711deed5e84767bbf8d5f4e86fc96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs that form a link farm, with several pointing to IP addresses and compromised WordPress sites. These links likely serve as lures to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. No scripts were extracted, but the structure suggests a phishing attempt via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d37970c73---36476792043.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/00037f2c9959bdc23dfa3da624abc574/daxem.pdf
    • http://suvagcentr.ru/userfiles/files/popepukakezikudi.pdf
    • https://kovosluzba-praha.cz/res/file/76418223287.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1262daae144f3a967c2d6e4084b8062c/tuzominozutirinigo.pdf
    • https://baxsporthorses.com/userfiles/file/rukirokobitem.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c6723ccf---19856776610.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfde052ef4d---90430837589.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a15149ab6006b6efba8f8f0b7c4d33ca/574997810.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/90439844825.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607920f9cd975---ravoroponumiba.pdf
    • http://anandamsanyal.com/userfiles/file/46081156470.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2bf86a4d---632287967.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1b62f71853f5daceddf6db75775ccba3/16481861771.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ogm37icm4d8r76i9fs2t9ae7ds/jebezofogijesigiz.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ca202478---vajeparikagaxemun.pdf
    • http://armanetti.com/images/63098337326.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/56e91c0e6c5f3fcad9256690f799749f/53989161997.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b956ca6c29---tudugu.pdf
    • https://siahotel.com/userfiles/files/10966350415.pdf
    • http://plnjl.com/userfiles/files/jajevogarupibof.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2f9a2ff3---xuperuvo.pdf
    • http://normel.org/files/upload/file/zewakulogixajinirunibof.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0df28b8ddb235292d307231cac45ecfa/wokapefowabamitatuzosu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fq97011m3k0m8rthoq4upu8mq9/79425275166.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nesasutepove.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=canalization+in+human+development+definition
    • 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_off00010258.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
font_01_sfnt_off00011a6a.bin
08fb598c9f88288ccd95dbead6fc46b69cdb659660038fa0b9906e9d5fe519d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 18116 bytes
font_02_sfnt_off000148fb.bin
33f28ac8f6dae6b3f7c99ea72f08c4aad4287b7f2159d4f5df4169930a807ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 10752 bytes