Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bc2a9cd1a05dc6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 02:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bec02dd4a92cfbd582df41cce5354d3e SHA-1: 9d4a33d5c10c612d7a2e75d3300016149030ca8a SHA-256: 21bc2a9cd1a05dc62e45cc60597c0ff74151785583a8f4422b806afd996e1a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=solaredge+27.6+pdf PDF link annotation
    • https://stancijanegrin.com/UserFiles/files/56003338806.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/42679673730.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609f78d60daba---20818959568.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/dd99b5695f8f8adc1e1518231b322179/ropozukijun.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/77583386366.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/miwaxexidujezezefe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/be421b920466b3be9e2a6daf9961a05e/65774727015.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/natemilebezelasoxig.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lanjsqoldk5ephobi6db81vhti/buvudo.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/13677148451.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tubadizi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gomuxiv.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/63988190602.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/33342631637.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa14643dc---vifix.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070323e7f94c---75265536653.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ea10f935---kafavuteza.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/xawoxuwuzuvifiko.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/wofajobikowexorovigu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc6236e12f---53377884956.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/15586002337.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6e2699adcb7dde654a84afefc4b55a88/lidapuzeb.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/60103191180.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/bekawutinukulowadufal.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_off0000b566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB566 16528 bytes
SHA-256: 9e59c05a8ce458ddf1642162725f3b6564415d1534088d3d17d6a4ab96352fc5
font_01_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 10692 bytes
SHA-256: c3b47fee6859209032c032c8ebb4a3c04819b87a47b992bc67e16eb950816cdd
font_02_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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