Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc6af5b8a0041c4…

MALICIOUS

PDF

72.7 KB Created: 2021-06-21 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 443ae6e41365676c8c092733eaacd6df SHA-1: c187ecbcffb27d01ed54c3303a249479a4a3df25 SHA-256: 2fc6af5b8a0041c44d61225bbe1931a41c2d5578d8e0b438153241c7b1f411c5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates the document's primary purpose is to redirect users to potentially harmful external sites.

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f5a91d1---56097539836.pdf
    • http://hasyo.net/files/file/85265288202.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/864118e51c00149e948ae8dff0992e18/63071743119.pdf
    • http://dgjst.com/upfile/file/59925379941.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889347666cc---getagider.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/xopadoforobevikimoro.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pljme9tvko9bgm5gktev7tqa8r/41517069673.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lc3chhj2efurecfncfadhhgv4j/76829967576.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790bfb3df61---41922426455.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c84ad44c50---49438833791.pdf
    • http://agriturismolescuderie.eu/userfiles/files/semosinetugativikaw.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282a59a549---94048000046.pdf
    • https://medsplus.us/admin/images/file/lovuxabipagofu.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2196adf231f2a281b17f747a02e66af2/33862844723.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773dccc802c---95885219776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cheats+for+pirate+kings
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63c.bin
6dccb0e86f461cc129073876074a355affe2b29f467d009df12b40023440c7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 5100 bytes
font_01_sfnt_off0000d791.bin
e22b6851b17f33b267af47d9cda1e2b80af990fb098db61eef50f013ba61ca8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 14424 bytes
font_02_sfnt_off00010138.bin
e3f41449e3d63d71b5e756eefa3037d7acbe8ae22d0e942a59360e8db8ee7d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16112 bytes

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