Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01e93636e857d89…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 21:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 998f1fc9d179ad8e146ccefe3b560c3e SHA-1: 962c523e9d7f2c80cd314cef2cd525f17047a856 SHA-256: c01e93636e857d8989e4753fb75a901e0506c17b971ff5f09272e992c97b93ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://houselandia.ru/files/37229671889.pdf
    • https://thietbigas.net/media/files/mozomidexoxexurina.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/82417364725.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/roxawipapujozapuzepujuxom.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/02cf05feee4a571fe6d418bc3768ab86/komikeruzokowuxani.pdf
    • http://tydafa.com/dafa/uploadfiles/20210908184833.pdf
    • http://kashima.cc/userfiles/file/jetozibakamojeduwuwij.pdf
    • http://kssi.ir/public/userfiles/file/44096944320.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mibodutapopobaxerenid.pdf
    • http://ivelinabozilova.com/userfiles/file/59816240421.pdf
    • http://tryinvest.eu/userfiles/files/52911241808.pdf
    • http://stl-hk.net/userfiles/96305136396.pdf
    • http://lacasedescaraibes.fr/file/20840003894.pdf
    • https://mobilaide.com/upload/editor/file/13965781869.pdf
    • http://busankid.com/webfiles/board/file///xowiluninutixijuf.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/44416612823.pdf
    • https://bayihoki99.com/contents/files/6488405786.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zodatigob.pdf
    • http://mindennapi.hu/upload/file/54208203625.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/1709693811.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161341077a342a---19378668239.pdf
    • http://4bzsoftware.com/Images_upload/files/83482266673.pdf
    • https://cebubigsellers.com/userfiles/file/dapiguvizesikovatipalemi.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef6b7d6f4---1695791354.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a9d545219623c86ea20435a7f51e4d70/74279226599.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clear+browser+cache+android+phone
    • 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_off0000d99f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 16792 bytes
font_01_sfnt_off0000f1b1.bin
cc76d9496b8ab8ba94b41dfb392fb9711a6cb641ad319b3eddd0f5b49056cc24
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16284 bytes
font_02_sfnt_off00011b73.bin
647bcfe0df1855113ccb352154e6c51bed62de1f24ca1878a4b3d16077fe98ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 10768 bytes