Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09a84bd0d8f5395…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 11:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58d34b37d898cc53b8abc917a8bed03f SHA-1: 8e936c825add127ab2eb6fde69264ad394ee4e8c SHA-256: e09a84bd0d8f5395b2da00b2caf1aa59419712934a8a11cf2a43258abd6bfe55
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the heuristics and numerous extracted URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ivankrivanek.com/userfiles/file/bivafuged.pdf In PDF document text
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/21403451685.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/68063064135.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bamumewijogaduk.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67840fa27---zupoxotumemevuvapi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/66461077008.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430466a93d0---94701906074.pdfIn PDF document text
    • http://all-premium.com/user_file/files/74615805299.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/07c3dc48e122d2c19f076908e2d24c9c/33873837339.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/89715840176.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109120104038715.pdfIn PDF document text
    • https://fultoys.com/userfiles/66117571088.pdfIn PDF document text
    • https://interconformity.ro/images/file/golidifetavos.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919172227.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219161048473008.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/tifol.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/48794822527.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/pegugikuruxozobit.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/15072963044.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395f83e041c---36669094249.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/xuwijubexosanefuxewonawiv.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/99278095921.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/17568592948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+i+want+tab+kodalinePDF 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10272 bytes
SHA-256: 877764b2057158df2915637f0444cc905f4d070ce93dd0796dfa5e604168a65c
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 17864 bytes
SHA-256: 3112d33bac9194a11e508a4ec388f8566c34e622c2b9c01fd34bf348d2d9151f