Malicious PDF — malware analysis report

Static analysis result for SHA-256 169d93f326d5dbdd…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 23:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d1a1f7a79bf454b63d2cb504a195cd6 SHA-1: cdbaf529529cc5e05afdc7c277e638892f69fc44 SHA-256: 169d93f326d5dbdd96b8aaca2fcd48ac04d451bd605f9a9219e3a9f0e57167c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://orbitsecurity.qa/pro_mvp_tech/uploads/file/6411539289.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5l10c3b8aj6sfeb1aor7ogqr46/63655914731.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bd032fb005e7f13be5d1998e6ed845dc/burexufolufokejot.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd52dbe8e---wepojasexiviratub.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/55f8d00996b83ece60234adf17f5c29e/gokagajokor.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fenidujozivewo.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/bojero.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/am9qcr7eokk6gfuev16ah76fvo/zavaxezimaj.pdfIn PDF document text
    • http://momsystem.ru/public/file/vutuvuxepolixosuxabutuxa.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/nunira.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zunojowogup.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/10454826353.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/44582214584.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090486fb1d64---tomirogifoxuvoketupazelig.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/55816205543.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/46317017304.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/raguje.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4fdddc9ba---78258815170.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54040d7399---82972760839.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/40832acb2040123b7840863c1a6f94c1/desukag.pdfIn PDF document text
    • https://daismene.it/file/muxataderiwijupe.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-18/20210718025209195308.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a38369d7f---wazijojuwodopabejadabop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+write+an+induction+reportPDF 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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16012 bytes
SHA-256: c6cadccb8290ffbc52d6b2946abf319b0c7182749b8b4b743628a963df6acce7
font_01_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10584 bytes
SHA-256: 1a9ebbe185975ec1d99272936ac81ff1c03fa6f2abf3f82b1846906f4915ea7e
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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