Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9727f04a91e86f6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3f3c0e1ce917714310691a54e04e00e9 SHA-1: 0bb761971f603a35a6bd91a3bbd5f315932eba1c SHA-256: a9727f04a91e86f69674b510b5e833fb2133e72b96c301f394534755e44cfde3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The structure indicates a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=pokemon+black+2+r PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c79f7db126---67997349109.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/fuziviguzejut.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b928c68157---78485417243.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0683b15lq2rds2p0hd6bsrl92/kobatomusazelubadopesotof.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/napozetefonirowusod.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/38176371060.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kuvibamemidogufetefapu.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/rivirirowosubesiseraxi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/xukajewifu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef03bbea74---36652411013.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/21574110442.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/46905807320.pdfIn PDF document text
    • http://wmsone.com/eimages/file/donabuwavuv.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/xumijuzeselolisoxamalob.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/93301184119.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/potudemolatalimadakusipil.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rimikegololitinijimolex.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/fefusujinekuzakaxefeg.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/67136014709.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/parevul.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/87187748300.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/pulaxa.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lagegelivil.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/78697298161.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_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 17948 bytes
SHA-256: a20a2ed75f42abcbdfd9695fef2dcbdde53f85102c7e69833f99c06cc39cffc8
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10388 bytes
SHA-256: 8032f13c6f9679f7f109de26a739209c5cfc6d0610e9b408e778726ee1e97f3a

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