Malicious PDF — malware analysis report

Static analysis result for SHA-256 4995ca66732d032e…

MALICIOUS

PDF

66.2 KB Created: 2021-06-18 00:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 570bc7466943a4918af369c48ea42988 SHA-1: 1392ea9a89c4cc1d911f3fc7406c918d58a1b1f1 SHA-256: 4995ca66732d032e40501ac8d8c247d964c22a71d7655867bf1deadfa319248b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dochoiotovn.com/uploads/userfiles/file/17365921132.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c23164d294c1a6f0d23d955ef33819a/jevuxuvedalisi.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acdcee46dca---75940119266.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ae8e7aaed9243b39ed6b27ca894b7b26/92541629479.pdf
    • http://jnafarms.com/clients/864068/File/pavejoxenapanidura.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1df3767cf---96188602988.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf11194bf---16150648203.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/itvvocqoeb67ll0ai0r9mhobd4/zokepapasewebozuno.pdf
    • http://kochamsushi.pl/UserFiles/file/32512824542.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/39575323396.pdf
    • https://celebicatering.com/upload/ckfinder/files/wifewig.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b36ea51f1cafc43ce5312f19626f771c/72817812432.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceec3605dd---fijek.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/18868988409.pdf
    • http://sva-jeanroze.com/xmedia/file/borowuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=korean+movie+the+flu+full+movie
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b945.bin
aaf1573decad50008afba87fd1843542da09b106f68a6bc5a8a20e09b10b8b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 3764 bytes
font_01_sfnt_off0000c6a1.bin
40cff4fee16f1734e40dee11c7080e181562d8f4571af9f81e13c08abe9bb806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 4856 bytes
font_02_sfnt_off0000d707.bin
f0a5fa3678d3ca9cc2cd4880b6afa5a018c63ddba7e9679e86bf86a9ea749b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 10764 bytes

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