Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e9555454165e6c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 21:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b167d79664f57984d73ff25ac37d987 SHA-1: 87defb015b974b0a1638d0d4abeb85d7e14391b6 SHA-256: 20e9555454165e6ccb4533734f6c969887da2069f084ea828360dd5c63806190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm, with many distinct hosts, suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/61ea762ceb67fabb4a199f1c39a57193/vetenenaxufesovul.pdf In PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210629_D1AC540096351387.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/23675148235.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/44997515623.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/voxajabifaruniruwu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/83990733449.pdfIn PDF document text
    • https://maturana.cl/upload/file/98301639454.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5eu9lbi4sns5vcvf4q99kris95/xorabegobusapagojom.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/7736237764.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/42d91313534768ed0e0f05a290de56bc/53909063771.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/8651927110.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/81640215496.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/613e15828ae82447953927eb3cf2d938/88286536863.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a780368a---93756715070.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/67656331088.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/79803525938.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/97634190697.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/79672417737.pdfIn PDF document text
    • http://cga82.com/admin/File/61430510793.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/gakogepobaxaxopoj.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gopudonofimowe.pdfIn PDF document text
    • http://teknis.it/userfiles/files/vovojituxudusixolu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/48dbcfe98d3321c28981c3f56310f6bd/xenewere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=archimedean+solids+templates+pdfPDF 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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 18460 bytes
SHA-256: aebc1571fc8a464d8567ab325cf5acf89e55936de3945d33aa8ce7962974844b
font_01_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 10868 bytes
SHA-256: 7203093be45fdf37ef712506373b3ded1ac17d976605661ab6f5aef8b679b243
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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