Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fca09bde1e4ddfe…

MALICIOUS

PDF

89.2 KB Created: 2021-09-08 05:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8428a077c4f78bd2ccbf2bb78512f2c5 SHA-1: a458cae158b910d62d2e8ee81ab7ae19d23e408c SHA-256: 1fca09bde1e4ddfe308beffc36194d2ce62d00b62009f6a2f6e706ca013b4b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://allytemp.ru/uplcv?utm_term=pet+speaking+part+2+samples+pdf PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c756c9009405e06c9c1177ddf9fba1c2/moratoboj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/73934047660a0b2b64ec4a.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/xevebokifojem.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/82813522827.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/436e2e3807723871274c0ba94dd694d0/95690163219.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdf58763c---76668868958.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/jiwudewulefekitisupuzi.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/47244741304.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/kuvadalusoxovesidotugado.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f44cc69d8f9---zutomaxun.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/juduwofulojururaratel.pdfIn PDF document text
    • http://bociany.sk/media/file/48474134306.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/rulijutoxovazekig.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/83113477476.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/87525207509.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/6330265430.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/36840322509.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/153ab6a63fb10361bac83e416e9ad58d/baxiziwodelonal.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/73996601506.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c1d6b3e748ff88f154ebbd4c26eecf9d/pimedogesepexupoxeke.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/72570879487.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a81352e3---busumirudopiragax.pdfIn PDF document text
    • 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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 19724 bytes
SHA-256: 8a24e91034bc92779dfe58a089331d2b38323d221f1b5124c184c9c37c46793c
font_01_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 10936 bytes
SHA-256: 9a0b8162e9e3bf184f92efdf74b18100e5bf0c3075b6359fb5020c2446c7aa02
font_02_sfnt_off00013f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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