Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c6c2155f8a50a6…

MALICIOUS

PDF

96.8 KB Created: 2021-07-28 13:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 256e90e922b83c57b4f90ca819795b5f SHA-1: 5fa9d34025d11496bf4257c2c2f4faee52c16923 SHA-256: 10c6c2155f8a50a614bdaa3fa3d82a33da47589f2b1dcfaeccd896913f53a889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ulrike-mayer.de/userfiles/files/xaxoju.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/da7bad23228b109cf77d0bafd184221c/21016526667.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/43215391391.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c19dc2a00581aa9d269b8f50e530f138/44276045858.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/84a5858e4b1175a0e730034e12c52558/tuben.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d478dc029a---sowomediponusadizofuwevu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ca923e88---76732506242.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zinuxawulafinidite.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/vunixadebarelazin.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/98481431104.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098311808e7d---gunodukudinuso.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490350c501---bamefivawinelas.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/70878072098.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/97755134465.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1rip24martl0552rnp4e3egv1/38194313469.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/5927160377.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/49258490990.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1090c89bc1527ff5073735e0ae17419c/matepugirodabakezara.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lc8c76hi58ug1lkqd4636hb9lq/93429090704.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210624_8F3FA67379C77FED.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c9321c535c91ce134d988bfc052a950c/62645448100.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916472a17b---gamukokolekomadewonivifo.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/27433333286.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/1991844253.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160876883eab00---65611920621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=codex+space+marines+9th+edition+digitalPDF 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_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 11264 bytes
SHA-256: 23f57295d6d01a81b60ffb593911c35b9f89921507fcadf8e28a27b605bda066
font_01_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 17536 bytes
SHA-256: fbd505202145c5af3a2e76b25b12908b1a5d10a24027091152afac94b98e81e5