Malicious PDF — malware analysis report

Static analysis result for SHA-256 a781f5339e4f5f27…

MALICIOUS

PDF

82.7 KB Created: 2021-08-20 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e042b82b618f4ba1535b9dce8e627da SHA-1: 8725d6537ce62802aac2e608f2f17a0555b66a9e SHA-256: a781f5339e4f5f278ded8f9e73fa534b14d032ad0ddc3440b7b515b982550dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=esl+reading+comprehension+worksheets+pdf PDF link annotation
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7sbo353bbtf8uijvng14aq2bsg/vewulupejametolodexareza.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/tevetufotivulafafusafe.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f930d73c0aa---69120978610.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a3s9ekpsoh5rbvusqknhe89nl2/81537286571.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b72db95827bbdee43d663d4b4c7b51a6/77566402083.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/khed1q5dj9hatnchene86a9717/94999025511.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/gamilejabuxa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a211c7ee0---tomobaguzelilamidobepoli.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/37907531427.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1989d55059c9acde8efee42bb478679/25956615953.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lgf0mqmpqofet2mme056ktkdl2/4002268305.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bef876a58f0---62416435495.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16108b13f602fb---fulomutuziseku.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xowuzedobujumadimifegokak.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b9a950f8---dobegewovarova.pdfIn PDF document text
    • https://arerp.kr/data/file///18315925368.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/74027d5faf8f7ad9e5f7238426cbdb5e/86713721995.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/95f823594e793b5f9a86f1307d79667f/suwuzamatodevekiduwo.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/61744058844.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/doxofagalogorokekixesedom.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7nk8g5s4fqen06diojgmpg6u3r/30566103973.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16480 bytes
SHA-256: b4da6ee4d642ce5259e429e4d0fd4df2feea63696d452a2a0113bd601174b86f
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 11228 bytes
SHA-256: ae0b211e7a48334cd6dd7035901d9b69e16970a4771645ced5d9886dfea3a14c
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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