Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f2762650cc93bf…

MALICIOUS

PDF

71.7 KB Created: 2021-05-12 06:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb5cf89ec2c57b5308555651a0ee20e9 SHA-1: 30a1e2526af27fac7321c42478075b65497c4414 SHA-256: 41f2762650cc93bfbd173312bfb7ad7d17f25172b7772350d857ef8475549fb3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and heuristics suggest it is part of a phishing campaign, likely masquerading as an "Ebay app apk" to trick users. The numerous links to compromised WordPress sites hosting PDF files further support this phishing lure. No scripts were extracted, but the PDF structure itself is being used to host and distribute the malicious content.

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 https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083981806ba8---fekibevawabemegijezibow.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b1a72584---24104704271.pdf
    • http://aashianarealty.com/file/koxafiganewekemefamu.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16077cfa4741eb---43713707986.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/77f82dfd9aa54a2950e634df9c6caea3/fevesafegakuz.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/13242f241eb3099fc010e0f33e4d94c7/katawaxoralivamokataribuz.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507065701675853.pdf
    • https://acronimocostanzo.com/userfiles/file/guxolozoli.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7a814129---povusurawom.pdf
    • http://ahkjt.com/upfile/file/47161387657.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/brjltmmtcfoaf3ha5qjlfch1s1/76900010477.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9fb2a9a3---rewiwimijen.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/67631043730.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/97bb5f4e12548011a8651cc079330488/wosesekav.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gugepiradulezunu.pdf
    • http://kompletucetnictvi.cz/files/file/84983929741.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7564506d---56364614400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ebay+app++apk
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce3.bin
e8303a3b7a50bde34254bbf24b7f95af8b1490213348138cd9b5e15f89c4c68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 4768 bytes
font_01_sfnt_off0000ed40.bin
bd1e61e678a61f1904e3808801d65e75d396a9171899a4fd8625e8f9eadf3a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10928 bytes

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