Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a59b4b9ab36425…

MALICIOUS

PDF

83.0 KB Created: 2021-07-14 06:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1e905faeb74911771709fc8998dc1e5 SHA-1: c84833dc6c020eabb45ee3d372c9ef7becdc5a44 SHA-256: 61a59b4b9ab364256c83b9c281777aa93c27f6d088e78e504c361052f58cddfd
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 compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://transit-connection.com/userfiles/files/1331420995.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/32230134888.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0453f5bad8334ba76cae16d23076ea1f/65249745123.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/19752709729.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/35327418230.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661ce3cc79---zelusosojiberoletabigogu.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/45872742669.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/geteloninewupepalira.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/38dfc71b932d95d76615b218e8204849/36487462774.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607897439daba---mividurobujibubukedir.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/wexinuguxafiwinabunuxu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ae148acc06d6c5c8a8aa38e98921cd9/19962575176.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c7e674a---40907767046.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4dcc125d---91269498595.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t36mtkj0ebqoj0ga0aoc0jtiap/mufodolufip.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078315f48623---37788004641.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a13733e80adb751b575bf64fd5f900a1/niludamasiduxupiwexek.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/92705325159.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1129009d9---mikap.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/4t0mip6fd9834an8m4hle78nup/5542841047.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8cf9cb92f---86032166901.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/sesobarojurapapajesizurur.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/buvoperokafotolad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=1.5+centimeters+to+inchesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16780 bytes
SHA-256: 4220a4c846f5bad3d5abae19ad3824d51eb3bac85c5cfc238860dd547ce05ddb
font_01_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 10440 bytes
SHA-256: 0cfea53926517e2ca23a378c07a9380119f2de6f0883d964f612f1ff74c58439

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