Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60755370d51f421…

MALICIOUS

PDF

80.8 KB Created: 2021-06-30 22:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0008b689902cd280fdf23069e6a5cd59 SHA-1: 6c019fe6614dd4dcf6819ce93e98e39b2aa89951 SHA-256: c60755370d51f421b7d474595029f2adf6aff5730695aa2c7eec38e01520114c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of distributing malicious content through these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/16bc9490e0a89921132930be6bfd515c/50056459101.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13d575dd8---muligujilax.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b771a28c---dosuxisovotofalirububod.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082f817acefe---1100380907.pdf
    • https://mollis.rs//files/72469443940.pdf
    • https://samavetpharm.com/userfiles/files/zigebutejorebebuponagi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a38926ff6---24919784956.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f184af650---43331239814.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l14t9p9taccpebm1gldvrr9nr8/talopazetuxegimabe.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/pilebasokozag.pdf
    • http://ketoanaca.com/uploads/image/files/23794825672.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7be4e3b6---memawuduzen.pdf
    • http://robertoantoniz.com/resources/original/file/87837970597.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d630c3e---zagudusoxegoguvafaveture.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce2b02a47---49298279459.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd775dff37---sivupitipanoxumorefozit.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b092c697d00---15864811616.pdf
    • https://ambulatorioveterinariosismondi.eu/file/80368225396.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/71423359822.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/psdv0ehmt4ard4ke8l6qb3n6gr/gimaseperalujisowamog.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2e3d031c---korosabubekakelevil.pdf
    • http://formel1vermietung.de/userfiles/file/2024699211.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3ea2a21fc301089fa6fc430e84c1bea6/57559836854.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160733a359a6ff---84529587060.pdf
    • https://isosklo.cz./uploads/2401027821.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ocuruopls83soglub4fq123q07/sopisurif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=8am+pdt+to+cet
    • 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_off0000d56c.bin
fc4baf134ad5b00c4db20bf7a724ac43cc1e5e6be3f1948fc9c979f741e2a680
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 10276 bytes
font_01_sfnt_off0000ec8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
font_02_sfnt_off0001049d.bin
020808d119914743d97be77643970795a80208c25c3db1905466d766cef9ac72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 18504 bytes