Malicious PDF — malware analysis report

Static analysis result for SHA-256 3289e7a376e2bd73…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 11:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68fc73a41102345bbf2a455bf51e4983 SHA-1: 495a785ae558f3bf739b1d877d382a2853a782a3 SHA-256: 3289e7a376e2bd73a0f23ee88bea42c39bd696c9fe68a44d6eac3f7c4afa102e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites using form upload plugins. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious or SEO-manipulated content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06a693370---xusoguxad.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b580c777---gulam.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8ac5df8ac5d69ed9666f6cbdb02aa993/zuwifolimiritakori.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/339bf3494e3ac44c5ddaa589a6aaf0ad/befuxinapomuda.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9dac477f---19231228299.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f559764d---10195468842.pdf
    • http://srsheicha.com/uploadfile/file/lurusibufe.pdf
    • http://strandedtattoo.net/file/podofopizikawo.pdf
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507091544177107.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce288e5274---fepenadotepawibim.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5972586eef---repavamebisomudipa.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1dbf7a246c034ec45841ab6fc81744d2/xutezi.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/nlrabe534h89p44vsi5ferebvo/xefipuw.pdf
    • http://nesemlak.com/test/images/uploads/files/vifoxegarilojisasox.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/70a1fe7dcce0cf0ae4ee357511bf4cbf/womikazu.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be50194e1a9---20224499761.pdf
    • http://klassn.com/ckfinder/userfiles/files/demituma.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f6gvs277oh1b6lqeg2i2k4rmi3/41230579592.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/959808b49291c96018a4c96d33bc3e55/votuzisomu.pdf
    • https://panama4d.com/contents//files/zapediwa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=38+hectares+to+acres
    • 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://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_off0000ddeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
font_01_sfnt_off0000f602.bin
aa2c684441df9c79bb59d33581e875c7930d56801edaf5b3d7a175716354d8c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10368 bytes
font_02_sfnt_off00010d9a.bin
587a3888bb5a3b5a046ef67b3f1e207776dca2157456497c03f95981dcf36b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 16968 bytes