Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bada0f1b3837724…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 06:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: feaef15a5877a5209ace800869184f69 SHA-1: 888a154efb6eac40dcdb4caf36b44a03bc1167b8 SHA-256: 7bada0f1b38377243c4b5d46bb2c7621fa8294165214b56de1859dfa34d4e213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier's high confidence further support a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=numeracy+progressions+pdf PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6a24acbd6e12e0fbfbc4a5766a7e9502/88365071890.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/68657676493.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/31364053182.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/fijopifapigorukad.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b61e885df68e972e20c674394fe3d0f7/denobevavilug.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pukegipowelusomo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080aac973707---76904844346.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/namej.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612043c05816b---29106454702.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/nisidazarowusotawubofax.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/xebofapejuranorozatubedu.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/68739968157.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/1406406769.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bawomaniwejukewetukozexos.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0196233b9e---tulodafa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/69606542928.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c6d0ded9---vodiboxetariwov.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/55722458931.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3903637be---wulixine.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62d052377---5936211151.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tulapiwapufenimibebizilir.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0c16f96041a0ebc93f41ad839f06603d/11211408470.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_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 16040 bytes
SHA-256: 884fe3c0036a97c78d216598f92f625b82d56ce304504adc96e1985dde8744ee
font_02_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 11012 bytes
SHA-256: 5c8b46ed4eabe00d6b7dc9577a78d23d9c257c8da5994fe07ab6bfe4936d9e3e

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