Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e153ed94d52915d…

MALICIOUS

PDF

115.6 KB Created: 2021-07-03 17:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c5c776cd956f9952eb272f8051146468 SHA-1: df06e28fdb8df482a30702a9a6c36fdbf097bb29 SHA-256: 5e153ed94d52915d328d36c5d2823ec270afb89e307a496e8fb72a2d5643e794
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's a link farm on disposable hosting. While no scripts were extracted, the nature of the embedded links suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 5

  • 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://protok.pro/upload/files/fadazijorugibusapaxa.pdf In PDF document text
    • http://say-international.eu/userfiles/file/kewekam.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7718573736.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f52c8fe125c3c46fe62eb5a53b4bde53/wokuwewoposomelogoj.pdfIn PDF document text
    • http://0930actress.com/files/files/tuwemusitituganomagiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8cd7481c---99824750264.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2988dd5d3---vitix.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/tasewidinozoxut.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/lerabovusabodovedego.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wanunedilijofolesat.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kepvq34ra2t8q3enq0oh661v95/98342366130.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/nasawosofujoxaleridezinu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2j609fh7mmvgdmkem4uv1uqfri/wogewepotelupezisixu.pdfIn PDF document text
    • http://bulmarconsult.com/files/koguwusoza.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ae6642cc---megoka.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/663f60c70a8f550664a776310b75cdac/labadevuvirevam.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/47140427349.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/68931277055.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/todisuvemafefuxixilunevux.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba29f9a936---75748755980.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160722bd8a7179---vezunudawazukabigufaxobum.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/6660735162.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24f2c90cd65edb4c4405cd7cfe498684/fojab.pdfIn PDF document text
    • http://ruihuitax.com/files/file/16925805288.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de8d047d1---62667235546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=all+survivors+dead+by+daylightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000177db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177DB 10824 bytes
SHA-256: df7d06a6ca38d3a5596f13942d0f5b8986279894e6890299e6410250b7e6e505
font_02_sfnt_off000190ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190CE 18532 bytes
SHA-256: d40c479e1746ebea7db80154676b4c946af1c964de144ecee0dc34c817d77a26

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