Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b028da24220083…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 23:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3de1732c8b323050886ae33bdb352a0a SHA-1: 38c2c0627d3194bbef14f16bb19c09f82122d245 SHA-256: 12b028da24220083ea4cf445004f8450d9b1a28583c63a266c1c8e21bb9cd528
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The PDF also features a link farm pointing to various domains, some of which appear to be compromised, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://luxesystem.site/js/ckfinder/userfiles/files/litogagopiridel.pdf
    • http://gowowdeli.com/uploads/files/zapepironow.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juvekejozulep.pdf
    • https://rafaela-motores.com/userfiles/file/najizabetaj.pdf
    • https://panoramabyty.cz/content/filezawomazas.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf6948fe---mojes.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bafur.pdf
    • http://dichvuhangngay.vn/uploads/image/files/30296861683.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/bofeporogojinagofel.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r7uaifl91ijqfhgkpjetekb7h0/80780228470.pdf
    • http://spakimthi.com/upload/files/61352197780.pdf
    • http://avvocato-callegaro.it/public/file/vivuzoteromutigujijat.pdf
    • http://merklink.nl/site/data/ws/files/50996622355.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d3ce5b9d5c2e3ddb0c0d776ea32bf22f/83253485692.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7932cde7---45530224821.pdf
    • http://kursadowicz.pl/Upload/file/bobibedujuxamoxisesajoluv.pdf
    • http://mabifitness.it/userfiles/files/lixinakug.pdf
    • https://bbu.vn/Images_upload/files/zawizotifugejopewa.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ca7c31cd6440216c3f00d44b4d70320f/mefew.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/47312354216.pdf
    • http://theclelandgroup.com/img/upload/file/demipokesokuviromaxisujo.pdf
    • https://blnk.eu/userfiles/files/posukakuzuwelubapifa.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/79347330373.pdf
    • https://kawanmto.com/contents/files/gudonupuzejirovomodetovu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+sims+2+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac8.bin
dee5c49eb0df15da0c37269d4aee393a56ffac3877d0066f4b50b3e67d646a31
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 17964 bytes
font_01_sfnt_off00010890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
font_02_sfnt_off000120a7.bin
6b218f70310776bbd09d0fa7969542a4536be7db2c4420b05de1efd8311e2672
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 10720 bytes