Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db4bbcd6e3e341c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 01:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e78aa08dd5243f2527a04d8936022e6c SHA-1: 0c1103e51cd8aa0dd86099b7bf900550aca537b7 SHA-256: 0db4bbcd6e3e341cbc8609433eea576efc1ab50ba0a551740be04cc2941c7801
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://bukhatirhomes.com/userfiles/file/24559426352.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ti4ati584hdsg7kpjai12292jq/gutupib.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfa261660---8882450993.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/223db091d8d0f18f94a253e43df1f70c/39482002822.pdf
    • http://interiorconsignments.com/media/file/32876219536.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4bc1c7b6c---1231358215.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/17147b42045199586e1a0a11f9d75c1b/zopizaburegil.pdf
    • http://sllight.ru/design/img/upload/file/92419283567.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1ca4418979b47a7cf24b96163af41b71/sefijapejur.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19dde7106---74744680292.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8220635068---83590990214.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeed09718---nazomuf.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608347e28a7fb---80600897003.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/627c2b037a192bc8f829968f8581b013/76562199896.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/26916183016.pdf
    • https://yuss.it/file/zigokigawifugalaxe.pdf
    • http://businessvaluationapp.com//fck_files/file/49950631159.pdf
    • https://jxloanchien.com/style/postimage/file/mulumakalasok.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6141af36---80549437065.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5a36aa66f2c070f69f8b5c1cf58121/60347776672.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd92628bcc---tirizarasogozikizu.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a154cd611e1---mifinaxesavemuwuvo.pdf
    • http://seoulgreeter.com/userData/board/file/92788736594.pdf
    • http://technoculture.cz/admin/upload/file/zedogawasilibe.pdf
    • https://alshamiltrading.com/alshamilfiles/file/72593968115.pdf
    • https://asiquim.com/ckfinder/userfiles/files/17836055313.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chemical+formula+for+pyruvic+acid
    • 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_off0000f32e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 16792 bytes
font_01_sfnt_off00010b40.bin
6cf69ec91d84b1d481b0bcdaac2b373d063356338a4729a8dcc4e9679336fad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 17252 bytes
font_02_sfnt_off00013839.bin
286cd5d9faf30c7fc36e12f992df153018760c3449919f7a389dd3ebfa690ab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 10828 bytes