Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc46786da5b00c2…

MALICIOUS

PDF

78.9 KB Created: 2021-07-14 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5999a1cdd37a0d62425c75b623c9697b SHA-1: eeb99c31c0d99cd10b7502efd6a5de72272c07c2 SHA-256: 8fc46786da5b00c2f74e8bfb65c793c50a2c57f635e5c4bfc21086a16c987d7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7f15c96cf136df9b0eed779b05141d62/62349204417.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/284kior73nd3bgrsnvinp4nrm9/41655373328.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5f096f16220709659e310abd81bc503f/87597984894.pdf
    • http://hanboo.cn/Uploads/file/2021052207213070554.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/1861203335.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/q6fk6od6al9a8rb9o20us5n40p/katomopimobufeguf.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/72dc52fd429726a0c9b3488c04172e61/60798787686.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88ce63f55---57241135905.pdf
    • http://uralinteh.com/uploads/files/21363598519.pdf
    • https://hgb.se/filer/file/97238344341.pdf
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdf
    • http://dent-pro.cz/pic/file/93600846466.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c1a62da0---52504498176.pdf
    • http://sequirk.ie/userfiles/file/43145957915.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c81a57ec5---pezisarukap.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rsn19lq2gcth3dg2l7g295po6n/dopavakum.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/741365a286d932c3bc139fbea591fd88/pipapenemodu.pdf
    • https://angelsstaff.com/uploads/file/ziserifonimizevi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c148627ad50---47535060477.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0b3c70eae737141f84cc8a13e875ac33/57242065183.pdf
    • https://urbanlivin.lu/userfiles/files/jofidegu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ca0920da752abac1461d0c8b1c0ffe3a/27446196276.pdf
    • http://richwoods1969.com/clients/861079/File/kanuxuxaweboma.pdf
    • http://richmediahouse.com/admin/uploads/file/jewiwarokaj.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c582b9e283f---73735077275.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xikuvezolaka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+should+my+fashion+style+be
    • 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_off0000d0b2.bin
00335348b9fa244562030281afc123e58325b31228924dfe291602c5f71689f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 10868 bytes
font_01_sfnt_off0000e9a8.bin
dc44b7740e4db34fa30aa0b26ac86533f506b8faf210d0bd35bec441a10b0cba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 17424 bytes
font_02_sfnt_off00011636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes