Malicious PDF — malware analysis report

Static analysis result for SHA-256 5700472a85437335…

MALICIOUS

PDF

81.6 KB Created: 2021-08-31 18:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ef398e8ecccb5105755a66b38fd1374 SHA-1: a928f0a93bd57b65fd28f752e5cab3a034758d02 SHA-256: 5700472a85437335d584efdaf377a3616e4739bbcb7d0f267d917e13fa0fcce7
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or redirect users to phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/9b970037737ac049d37adf65fafa8a27/raxabazo.pdf In PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/13864660914.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65fbb9ac58---21503109953.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/66gdlde41b2kdgl64dn6dsvks0/47825382130.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/10812651897.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3107b081c1d420499f05caa2e55a9d43/giwubedogagox.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/99216152527.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/diwisopifubozaruluzow.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/45222426004.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/36021202880.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/921eb5edb03ae5fdae4b0599331ed822/rideter.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b918c6d300b9e97981a14afba3b6f160/5118702509.pdfIn PDF document text
    • http://melvin.cz/data/kefuxogujisakoxomusiwef.pdfIn PDF document text
    • https://linardi.ru/files/file/ginafowe.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/049465e024126ac3efb2001f6dab147f/45240088407.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/70007069269.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/luwobujazo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/piwojuwaruziga.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe54d199e---lusoneketasu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/4128014925.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/12088115086.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jr0t1pv1qts6lrttn6i2gnfvhq/12937124109.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/54236406375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+global+politics+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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 10856 bytes
SHA-256: ff4e791d833f747c81178b54bf13848777db943a883c6b60b84cc18275443040
font_02_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 17972 bytes
SHA-256: ba14bcce96fd12eb87072210223e04d9389d8365e237a1e0e81ac536b15ef103

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