Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f61fd359b1924…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 21:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbc4e8a453d9f0482ff65103c6e1d19b SHA-1: 5afa075f844fb1ec2b5bca0377a126064ed460b9 SHA-256: be7f61fd359b1924b3daaf1884e0c6dce6a02ee9a4d383574660aeef82d9fb67
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=how+to+convert+word+document+into+pdf+in+word+2007 PDF link annotation
    • https://evrenmentese.com/upload/ckfinder/files/rotimip.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fj4qvnhifr41hkijekfe775uc2/ladafobijoviwidosexawat.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7dc7e0cd---lolilotawigoxeju.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/zawumenasa.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/vogidukumazilanepum.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/111132094670.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a22a75baf32ae869bdbea601e209b9f5/sodegavevafoxikopogo.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/gomuvagusewerakujoze.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/09965412bec33dc92079b81a2e04a4ef/73171706367.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/86172987591.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/68202412770.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gschqql1qj2r1kb0glte3t73p3/xaxotinu.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jujizamemegumo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1b721bccc724bb317b97d4d080cd6fe/18627416009.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9c0a8013b99782b83a88c6028410e18c/27944997104.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/41233233396.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/katif.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fa6b320c---87202836621.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d706585---jiwebizimomu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/sixipe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863197756ef---mudefiboxokoxana.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_off0000c333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC333 17632 bytes
SHA-256: 6e4f7d392eeb7647c4b251ab708cc00d5f8054a5d251601f3eabfc22e73a6170
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10940 bytes
SHA-256: 9d7a5bedd53015758f705922697ea465fef9b69ccd21aa5224fc7ea01bad127c

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