Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bedb5df2dae0bf…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 03:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 28d264071e609b14a4c330540300d8d0 SHA-1: 0b8e74f6fbd2c268fe510dea4536cd99c182762b SHA-256: 60bedb5df2dae0bf6a7fefffb30ff6d67e64750d1561500008cccaf793f40ba1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vector-mebel.ru/uploads/files/37361648677.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160756902b5796---49089327778.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/mamipubuw.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66169004936.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/24244147827.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/62610070045.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7f7fa8477769d1297a1be8a405aec770/73551911021.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/timajumupigubozale.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/mikilabirinu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16078052ccbead---gogero.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/op5h2743e930aitt5n35gnjfl4/tanumifaziwusavijaw.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/072b6a106035fd4fa705e5b9d73532ce/61848542518.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c259ac900---18402679759.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7aakmiu6tuk86tdue4p6qif9h8/87105789726.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ca09e389---26299661864.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/3668414934.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/amke56tsoe3t2vk73g9g5ufav2/37121324439.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pofubune.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tobuwiwoxumolalabotolebid.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5725f55e---govisunukiluzebo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce79b1996b---40508059877.pdfIn PDF document text
    • http://mopron.ru/upload/files/nufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=livros+de+luciano+subir%C3%A1+em+pdfPDF 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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 19504 bytes
SHA-256: 20eb21e0becc7eb4e28cc19136cbe6c7dfa5d9fbb680b37abff4b7d8a3f91c2f
font_01_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 11128 bytes
SHA-256: 21f5c352543ea659da5280b65f561361d49cb3725fad550e4c77c168a6e43d81

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