Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b09e4edf205ef8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 02:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddea17b5c025f6015f4a2bc4af05f6aa SHA-1: 7a4ee80097370e8571a05d7d33287c911fa44f31 SHA-256: f7b09e4edf205ef83fb462045bdebd02e6893b25b14d83403976fdc5145ed9fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=paper+io+play PDF link annotation
    • http://dezmaster.com/userfiles/file/70885733070.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/72881553148.pdfIn PDF document text
    • https://sinarwaja.com/account/files/bokumugewivudidosedalobik.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigunog.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/8354389953.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83501407119.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143c59bbebc8---xukaje.pdfIn PDF document text
    • http://koutingchina.com/upload/files/80129848948.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3c2c5067---kekadikujapaxujaxaxif.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mulewetepetojamozogak.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/15705876025.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqlbigtdm2o1gi5ig3f0oik0uo/88608508249.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/zivitewamerogumizikakabam.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/74176011947.pdfIn PDF document text
    • http://elpijisystem.com/file/11272940233.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/jekiwixufukaja.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e8a3593c---91343529498.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/50645949182.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7579dac7b390de87f2c0cd30d5ad0903/35340047079.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/xumuwam.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e3f64748---ferato.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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 17636 bytes
SHA-256: 1e0261a4889e3f532d393e5fdf3c1411a34f1c20c16aa5ed9c8df7153c8ab3c1
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 9988 bytes
SHA-256: 1e1bea360173ed8ba35a21dba37d99a5acde4af3f86f5a53025b0b2a182bcfe2

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