Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab5d2ffee11e3da…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 01:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f3bd1a4d2d870fc93e7f6961ccb3b95 SHA-1: 2a5e44cfacf50f3e13f0e75e8774e2e6410eec62 SHA-256: cab5d2ffee11e3daf3808cc9ad58e6cd0ae35dfd2d91e34e39aac85d277e1758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or second-stage malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support its role in a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=nda+previous+year+question+paper+pdf+download PDF link annotation
    • https://akita-inu.lv/www/files/files/99222416358.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/fefiwavigemoxasadi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/naweruxubebavede.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/78707fceb9b57145eeb72f6b6fb1209a/lazuxevivesozamefowosuwen.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b64b8bbe9---sivop.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/togogevixo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/48979375892.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84242624a---wezevebojuk.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/30581106667.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/10860059124.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb15810509---52360686187.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/7033366026.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/48909702962.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202172784375474.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6b7fc2a1608d6025a54ad1de7fd2de1d/dotanibusudifi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///32382639392.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/7352919737.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612163c69ab38---77245084436.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/jilazagagojorebasorire.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611372698157a---bepopumovugupopaw.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc95734690---79610671864.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dorujopodexoxugumasobasi.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e7f6a2b3da0.pdfIn PDF document text
    • 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 18124 bytes
SHA-256: 9348d41b963d64d9323fa118aa3c43ab190a7c10338a22c067bbe7f6cf8fb324
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10980 bytes
SHA-256: bdf8beeed06ebb59144de99f02fff280c53a1fb05f6b4732335e2c6c791619a6

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