Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c18c46d966f2f5…

MALICIOUS

PDF

99.8 KB Created: 2021-09-08 09:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a169bd4b92f2dc6558a0799052c7413 SHA-1: 6c8e6fb5b6178bbc8484bcbb4c4c2dc864acfd8f SHA-256: f4c18c46d966f2f57e44ed89a5082ee4b1feb51b17e94773a01b44e8fd671a8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users to external sites, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lyzjkgm.com/d/files/79237467580.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d07b37442b6---vadatefutaxixodu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/logarijetelukof.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/52946124273.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/23440779261.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d75c7c5b---29039231404.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/96256590584.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/81998794309.pdfIn PDF document text
    • https://hssanesteban.cl/files/82321780153.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/57ab0098c1de8fcb93b77457f746233d/lofobo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/64859316655.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210825_B59E6C4AB7674F72.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160849675151cb---jepofu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112e0c0ae1f5---5216471726.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3c23f6f7548c9a6bee9f7639a2203033/5109426789.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudoxokeweromakikosek.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/juzabexodegojawirujole.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/tijavozavemejanajun.pdfIn PDF document text
    • https://krossi.ru/images/content/files/sexoduxubed.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/31193913562.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/bezojaxigu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/50bfbb5d022ef09ea3632d743e313b29/42834688743.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/erk34ar4csi9326ujs3fl99sc5/lekotarataduragugugekaguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=notes+on+the+caucasian+chalk+circle+pdfPDF 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_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 19036 bytes
SHA-256: fdd317f9a3adf511426bf33f5b263b8d12f2012f05e02fe7ee6f724e87895c99
font_02_sfnt_off000168ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CE 10884 bytes
SHA-256: b979e67fc5c3f58f4e0432802535b1a17596cf676b4470c9c0a52c6255a90f41

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