Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd55a903a74e69b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 10:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca99ea5c20ac693a95cacf0c0254ff46 SHA-1: 963811e8a297841b7c269641fa348ea886be4a8b SHA-256: 1cd55a903a74e69bb9e60157934a73548f73efb90ab766002509d75fc352db13
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3e08af72746729e24cba9614fdaa480c/jedatokixokoku.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/da45kbjl8snppajt3mlvka1ojt/77660624450.pdf
    • http://telegid.tv/userfiles/files/bevawav.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6fa547faf504c4a35309ccc976baaae6/xupofarevepi.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9b08162228033b09bf1a0ae15113a62e/luxipivodol.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/443bb5404f387ed6900784dd216b8ec9/19463059775.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210519021154.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/44985646089.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608299d486b38---desizaseraga.pdf
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/fbc8ca9a0029602aaac0a8c8cc7cbe70/divegixixibu.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdce6c733d496d28513017aea06d4594/75951005870.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/26c404cf5d1ed1ac4697e0ef92172af6/gulakiwozajepumi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ca4e827a---16020159254.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/8088364656.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb82bbd55---53725276419.pdf
    • http://beijingxinzhi.com/userfiles/file/20210630220338_1284822700.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/dedexuxegubisujutafatazaj.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t37t5ppd0f7i7b4fhtv498ikl1/buwemiremigoge.pdf
    • http://meadescafe.com/userfiles/file/tizezekuneruwogukezubale.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081e8e7dd1e4---20625640660.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7aaa0be192d5dda98aa0f0fab42765b/2159008000.pdf
    • http://www.anjhimayath.com/upload/file/zepojemirulezi.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nowitapazabixoku.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075139041c3a---93782318835.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160996b3e09b56---18436903146.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=carey+mulligan+far+from+the+madding+crowd
    • 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_off0000f230.bin
e13cfb70c18e47575baeeb638f0e28b2389c7ee92419638c550a468b727d3c27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 11088 bytes
font_01_sfnt_off00010bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16792 bytes
font_02_sfnt_off000123c5.bin
2a6bbc75a483a9926da1d2f514501449af22382e6a41fbfcd5c6fbd2b4f969b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 18012 bytes