Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e23c3fd180708a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 02:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 212d6e5476330eb5f4cc05bb600d2eea SHA-1: e9224f928abaf4dd53a502e01ab956ee20ed05ba SHA-256: 26e23c3fd180708a25d994657f2bb874a9b77a3365ccab1c8871d34f2dfabb4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://allytemp.ru/uplcv?utm_term=need+for+speed+shift+ppsspp+download PDF link annotation
    • http://sevoir.hu/uploads/file/28768722295.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xixewujetugobatatitu.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/8608035390.pdfIn PDF document text
    • https://felicityokolo.com/file/jubizoj.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/24905579551.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161359d35efb28---zomupow.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/31881020257.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/88100178595.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/94297312138.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • http://metall-press.ru/files/xukikaboderamabimeb.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/navib.pdfIn PDF document text
    • http://jawarakreasi.com/file/67021563624.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/zowadizuz.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/felezezuzenajov.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/luxotawigemasinurosozim.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/08fd1f9e68c3afee2403cea896d722d2/60376688389.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/81030584706.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/76885104075.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210918082949.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444e947f1ae---61895794923.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/lodonaju.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/sefawuxegaleditipeju.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedf02a84b---milefisexajunud.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/40326552624.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/xewupaw.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 19164 bytes
SHA-256: 1f93b8080b467fea27da03434a31b2b74e170306c583a838da74ee5db8aef54b
font_01_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 10656 bytes
SHA-256: 5feb073fce587e20446cb4d0f4a3d4cfcd5fbf649ec82754946a05ae95916cc2

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