Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d436a8dc5ba27e…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 11:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b41c164a368d56b0a1a664afbf33b2 SHA-1: 9f22b4e4f79d0d250bc061d089176666eb42988a SHA-256: 54d436a8dc5ba27ee7f37ccebd8cf981db5be56fdb96d5248f055d7dc01d8928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://reguitti-engineering.it/userfiles/files/nenurozodujifuwupeled.pdf
    • http://icltindia.in/userfiles/file/xofofigirejivuvesure.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdf
    • http://finalstage.biz/js/upload/files/farodedekuz.pdf
    • http://akkoryazilim.com/userfiles/file/domuvat.pdf
    • https://communeouchamps.fr/userfiles/file/77758493875.pdf
    • http://handbook.hu/upload/page/file/dotilakinokedexunozowab.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/besesopotided.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2c6206a8b2ae4ee094521ea87bfe93d9/valejatagopo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8821cc62c---gopiridepiboxoxijab.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cdf68715---79684035591.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb6bd7610---53031532953.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6dd4742ff6d4e654de05457cec15506b/746198493.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099300978c7d---kikesat.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a28911764ee---vafeletelowapidoju.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e5f9ae3be8dc3c726f744db724cf0ad0/85321480749.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/35d0568a0bd189fba2ff407ee0f074f1/84132965257.pdf
    • http://www.alfapilates.pl/upload/file/vamiwuziganuvetozobiged.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e060eb7b773935fa644e20b3e4f9d979/36060563176.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b217816d6---devimaxapogonilusamu.pdf
    • https://istanajp2.com/contents//files/19922996016.pdf
    • https://ferado.vn/userfiles/file/pibizoxonujet.pdf
    • https://superchills.com/userfiles/file/94492406815.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=answers+to+employee+self+evaluation
    • 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_off0000eaa1.bin
dc9323c484861782103f51b954267b14c413f0b3e6fb38a71ba2f155283e9975
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16636 bytes
font_01_sfnt_off000115d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 16792 bytes
font_02_sfnt_off00012dee.bin
67907ce8f57fae5f5b2d40d1b7734c5c9619eafd6869717403231ea43ea1c298
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 10864 bytes