Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ad424ea0fc4ef1…

MALICIOUS

PDF

87.7 KB Created: 2021-08-31 13:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aa0dde70954f69e6afac49e749d233c SHA-1: 16979e91a0a50bf30f1246a4a0822978aed1bbbe SHA-256: 90ad424ea0fc4ef1ad7c850d7a9eccc9fbf0fec13b4f0a4c206d81b0f47f77e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://noospc.ru/SITE/files/editor/file/gorixulikanazitu.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/uumvfchro9mru5mk6o6ujuas67/13813205408.pdf
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/961051876.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d1e8a87a23ac4d7fb6ad041f5dd8127/33412399409.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1ee69ondb40nukb7pb99720785/sepagumuvoweb.pdf
    • http://cobmedia.hu/include/98438439742.pdf
    • http://axwelindia.com/uploads/57164022758.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9d3b0d53be198648cb6c6cc2238cfa5d/koxujituk.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lig160i3r48rm0lnnp0chorgej/bugaxitugu.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tejirafumur.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a7fc7fc02af62fc463568a1200694626/18581140841.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v906kc4k40q0un7l76efpdsqnu/livaladugagiwizulof.pdf
    • http://uekekb.ru/!upload/files/fikobovolatavutexuzuketi.pdf
    • https://koncnc.com/genelresimler/file/vadulojibiz.pdf
    • http://www.ferm-matic.fr/upload/file/zebifijetosisar.pdf
    • https://kodcomputers.ro/2664/uploads/sotipuji.pdf
    • https://lacecinella.com/writable/public/userfiles/file/mukavive.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/476797b8c830958d040fdc0860e160ed/libilubava.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/genesexexaromeliragebikid.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/52801434465.pdf
    • http://gift-founder.com/archive/upload/files/13922248143.pdf
    • https://spandoekland.nl/userfiles/file/naziropibikenalug.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b7f64e13---10204182865.pdf
    • http://monkey-do.net/userfiles/file/vaxorasajezazi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wally%27s+pizza+new+concord
    • 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_off0000eb90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 16792 bytes
font_01_sfnt_off000103a7.bin
3c5b5a84de9760d81539940f815eb25b1c2eb57e6eabb5d668924ef8989f9f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10696 bytes
font_02_sfnt_off00011c6f.bin
f14f5b8cdad11b697f8fc0497df076bf85a268c9ade8e660f4f5c7b7263a9253
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 18968 bytes