Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe606b342da4a1a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0481b0831487950393daa8adccc1b8c SHA-1: 6d6b39f79dd2817734e249c923ac6e38ca7c7bea SHA-256: 4fe606b342da4a1a34b50720d09ab48fcb482064f7b8193f86258cb9665af72d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6190

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://oniceh.ru/uplcv?utm_term=oracle+database+concepts+pdf PDF link annotation
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/35567820926.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/67554566809.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j1cafnf026q8rdq3q1snq4eg3v/98862349423.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d446f09adf---66957722069.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/nibenu.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/51146925102.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/46285941334.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b3c942b783b5f48dff18a152aaeea690/34344730997.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mufuwuwoliw.pdfIn PDF document text
    • http://ladna.pl/user_images/file/77041553073.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/75ab592f6b1eecd3b48547cd5dc6cf4a/wefobev.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/busakifupaki.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/721e8be4728bb5937c1c0c001badf47a/86685339221.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb29de2b35---51403209850.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/3058702100.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1f350f9d---rijisezagebijutopewik.pdfIn PDF document text
    • http://orem.mn/uploads/files/39810898183.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d6e732282775646a6fe9be7d1e121cc6/pakuki.pdfIn PDF document text
    • http://mldinsaat.com/image/files/27652183434.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/70810093244.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db101cb6e6e7e7291d71a592ac7eaf6/wetabi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/65991617696.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088e64789297---tisapadenodoxevamopin.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/29527260943.pdfIn 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_off0000c3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EC 17032 bytes
SHA-256: 92a988fc40a4d895e9c41b8f8c1d8fc16bcc40c8f3bc798fec50a98a7fa45e07
font_01_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10688 bytes
SHA-256: e837e3a5b09bd2526ed6c0faa9a82f85da6b2903a62c931c8088b7eb39ea249c
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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