Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f7aa3ff33900c1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 01:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7650a6b603a391e24659ce8559716c9a SHA-1: 52f5f8f3ed026c2619928202ded3c0b0187eb31e SHA-256: 08f7aa3ff33900c10a907403994cbadc8fb8a66d0b7a7c7c90ccc40970effb74
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=device+settings+android PDF link annotation
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/37469099438.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/tijososa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136111884962---kavekinosapakexapezarosig.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef36014eae---39249456725.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/21936828985.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/15bgejkm1dvh2k2l99mi7rco4j/32705508230.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad9e9d10---dulogufilegekeweki.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/karutimadibamewiramujed.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2b2803d81fa5bb0e5a56b8d9ec460fd9/romilato.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/nerogugazisovopelapepero.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/pewagilesusu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dawifevaroben.pdfIn PDF document text
    • http://silver1979.com/upload/file/mefawabevopexamir.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4dgmsr32268l72l5qgj0kqlv92/woruronukikusa.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/28374250205.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zesazo.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/sagovuropumepiwimovole.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e8cd518955f455f9ff701ef70070f928/marajinajubewe.pdfIn PDF document text
    • http://showdoimovel.com/files/files/xijuliseripamobadotefisi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/15686763802.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130240d20188---laferapezukanipa.pdfIn PDF document text
    • https://vleek.com/uploads/files/senesolaz.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_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 17420 bytes
SHA-256: 6a89352892eef9f51556e4528747001b6cec7ef285090876dde778038120c13a
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10564 bytes
SHA-256: 3aefb7a7308426a6215ffef3aa7c90863226ca0632321fcb1ce063186ace9989
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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