Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72f256571c698ab…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 16:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23505e18aa44762d34156d1a25ab5775 SHA-1: 2cf2f61d7f2dbd63a896cd2b723bbfd2ecd5de0f SHA-256: e72f256571c698ab8284973293f919413e07f43a5ee51009a26c97d152bc3966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised or disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the 'link farm' and 'SEO disposable link farm' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tidurmalam.com/contents//files/tudigizutadid.pdf
    • http://web68s.com/upload/files/marexenasobelebipim.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0abf94f974e26f9d904803e599c3b5e0/27548902877.pdf
    • https://cottonweb.net/userfiles/file/nujuvexolegolivupo.pdf
    • http://ingenermarket.ru/userfiles/60844537466.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff1e00a3d---susavujosulidaxejopo.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10e856757---9057034192.pdf
    • http://livelyway.com/ckfinder/userfiles/files/11937793227.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jvmsg68u0f5gr9qvcumj5ta61d/46716326502.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/11614441902.pdf
    • http://songhakbbq.com/uploads/files/pagiwoxoje.pdf
    • http://interno-kazan.ru/upload/files/vevaroxububazujuni.pdf
    • https://mangonebike.com/uploads/file/jupebaxodamanavoben.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccf0584ca---60326731605.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a6e2476e134d27e5f013ed6fa9a2c62c/47505243887.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914d0da4a9c---kamutekavafi.pdf
    • http://lideparts.com/userfiles/file/1622682235.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kabopipinajijetivevaras.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f656b2405e5c355a45d38bb4b9448b35/difabesaxulazapu.pdf
    • http://niezapominajkowo.eu/userfiles/file/65533846505.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1onu6jfdfkvpujt4ol8b5qqp3/kutukikejujok.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff61422091---nokok.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85b77e90e---44284336333.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=farming+simulator+19+mods+android+download
    • 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_off0000e600.bin
35d70b2cccd09bbfd663e71aff3ac9a3a4d981e8c65bed3b781d743b3a0dc54c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 22220 bytes
font_01_sfnt_off00011cb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16792 bytes
font_02_sfnt_off000134d0.bin
45117e7423e5d51c0bb2a32d537e45132cbb83256835da1f81a7ae70d8169ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 10844 bytes