Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5ed2f25f4c044e…

MALICIOUS

PDF

91.7 KB Created: 2021-08-09 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19369022a717d8b19f9fe991295f02f3 SHA-1: 1df90149e72019f4683130549d86ecce306398a0 SHA-256: 2d5ed2f25f4c044ecfec8bb1bcd4b16c18f9beb421b148a2724c6c07bc96f7cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting similar file structures reinforces the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba09646df---88349790892.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c929ea99f40---53721775553.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c7d65772---zekunikibefafapes.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6f951a8f---68200693228.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sr9kjpkthkflujc0dtlttu37jn/fonowenalesibolokuze.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f866f230---robuk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e456400138a4aada533a5657bab4a618/50862585038.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/10946158692.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/sumuzavixetudo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f66d6fa9c5bfc31f75c67a5ee2535291/juneselanit.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/58595669687.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/dupituzafezapo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/lovomegefelikizatuwewiwu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3232f9b472---vuzatodaz.pdfIn PDF document text
    • https://carlojans.com/cms/file/ripawowututisopaxirasebap.pdfIn PDF document text
    • http://hanleyresources.com/images/loravifadabotivowifafuruj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa70d0bb42---37445597277.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/59119271095.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6a61b58f---24721029562.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0f66682e0162dfd1ea22f7c64c8c3a67/20717483281.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080603043173499.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a12b7af3fc5b2440115e2c1ef3bc63f6/97674092905.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/nixovopitotam.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/jovegin.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61bdbd084c---87462667000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=percy+jackson+3+pelicula+completa+en+espa%C3%B1ol+latino+online+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 18188 bytes
SHA-256: 9b85c853998c18320ee9a84177174c3a1bc6243cc6c58cd62f0d94dcb060d700
font_02_sfnt_off00014180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14180 11532 bytes
SHA-256: ad801d48369135ac60b71fddbe8fcb0b0ac0690a2d76f4215d9e863ee9c5d2e0