Malicious PDF — malware analysis report

Static analysis result for SHA-256 f980421828738c17…

MALICIOUS

PDF

102.2 KB Created: 2021-06-25 18:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a5a51693c5d649917e62d4b3dcae90b SHA-1: 29fefa7380a297d634e06b8370566a02062d5a2e SHA-256: f980421828738c1778e7ca5143cabaf2b1cd221d74a8eada952b6975c74b61d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, presenting multiple URLs hosted on potentially compromised WordPress sites, likely to trick users into downloading a secondary payload. The presence of a 'download button' lure further supports this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945ac1bccd---kegopavapexowederuxeleb.pdf In PDF document text
    • https://magerp.org/upload/files/mufokitapejetumabebada.pdfIn PDF document text
    • http://maclashoes.it/file/42974917655.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7744f13bf307019455ee54c512f777f9/4952376616.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99f4ba0e3---zitiranivorodumuzisi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/isnqb1i2l447bmnqkhtgqub5f5/22691532688.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/zaxikudonuladasedizadek.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609135294e563---95546233190.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgco1sb4gs7mpr2d2bmhbp16d3/1390613791.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f282d31d34---fonerokakof.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e4904cdc---60080518720.pdfIn PDF document text
    • http://bjjiffy.com/upload/jedolixefofo.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210618145141_hkl8rv.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/094acf527ae6882623bf66212f59abab/82002844227.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/jajoxuw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8228b0c61---gemojafudezon.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gibakimuledotozegaduki.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/mikoniredafum.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/39ttduo3032nn31s1jkudb83j6/13521339661.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9578ed63---danewabate.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160758b33da2c6---85499347361.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3cd36ea0c5e8ac96268d3b7e8ec6633e/dezobol.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc9872b51---73080230478.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9458aa40e5---11627758283.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/46578630901.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb87994c8---47209199256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=degrees+of+comparison+of+adjectives+worksheets+for+grade+5PDF 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_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 17932 bytes
SHA-256: e8f9115f2627b55b92734b7bb26f900af134ead945142da30695507cb8e373f5
font_01_sfnt_off000157c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C8 11528 bytes
SHA-256: cdc3a370e9d4b4f496e2a082e436d863a640ffcc948e732c6719bcbf2dfa7749
font_02_sfnt_off000172ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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