Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2682782c99d5811…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 14:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc21ee821229ac97cd55e3ffbf79eef6 SHA-1: a98a91847fb12df30ad2fd19bcfe3686acc6afba SHA-256: b2682782c99d58113d3de461dbc108a6c49a68caac2bdc4c219455bc00b471cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including WordPress installations. The presence of external URIs and link farms on disposable or compromised hosting suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=poker+mindset+book+pdf PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182dd2cb99---25079760504.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/36233687062.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/22ebc5fa743bcaaea498ff218573c5bd/xexagavapefekodapuwodewu.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/nipogeviwaxezajad.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcdbba302---betosiv.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/57891076488.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/fuxajotovozajumujurigir.pdfIn PDF document text
    • http://kalikraft.com/images/file/46843817898.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7735a8e24abd58ab3aaae2e41044eaf2/8766684396.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087388165021---gurugiri.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fenufaf.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8ca849db---35999801478.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83eff3642022bf5203a638e5770ff9a5/29637002295.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/wobajulaxejemojobenutin.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c355b4def94---54628388575.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/b48e17eddc8e21bead9b98fc39e9f340/66159069251.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/55544408168.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nisolukavifomi.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/mikodobituwat.pdfIn PDF document text
    • https://dellrein.ru/content/file/24356369076.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/53047081254.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18203d190---80004559107.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/337f165101283a052b0129608cac707b/77805872023.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 18076 bytes
SHA-256: 46ffd1459d1b238c2c711d774c7b10dfd0f4e1d0b29c0e17bc842782ffe5257e
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10684 bytes
SHA-256: 1837c15415368ff2074ed460befdc24514321a551e67adf999b4ad9ba84c4c7d

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