Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec606aa39c4d760c…

MALICIOUS

PDF

71.5 KB Created: 2021-06-03 12:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a912120db3737dc2ea8b8eef1bfe8d4b SHA-1: e26f073dafc02b4ba23c365eb880bcd1e05bf328 SHA-256: ec606aa39c4d760ce716e76aef0afffcbad18f87dafe562efc9a758c9dd3f90a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs are designed to redirect users to potentially harmful 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0b1333or5u6ekdt6maja9lifq/73855275527.pdf
    • http://brukbet.com/user_images/file/23591377534.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082761fca90c---87200618318.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73f1f2302---jivef.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a176262a---86733711684.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af83f3ee43c---5414093690.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac8d958be---14839047218.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hpef87age8e2098c1djmrrnjj6/51342310317.pdf
    • http://sparkpro.lv/content/file/wofiruxakozoxufa.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c75772ef1---mutik.pdf
    • https://africanresearchcenter.com/userfiles/file/21453806050.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc544115be---vedere.pdf
    • https://bititechnika.com/uploads/file/96722094566.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3634fc75---38800308132.pdf
    • http://vizit-k.net/uploads/editor/files/zubot.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8083104d2---15501733720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=who+makes+sun+joe
    • 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_off0000cdd5.bin
b37ca00c33738a93ffc776e502b165eedc9ffe31261fdc5b8c9aec12d8c61c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 4704 bytes
font_01_sfnt_off0000ddb3.bin
1162eb75839ffbc1a07cd260b90938fb9a13bf1f9652d492de5ed73b737b97ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 11048 bytes
font_02_sfnt_off0001033a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 4324 bytes

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