Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbeb89e1cfd3634…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 02:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42672b46ab008461d5a4770681f3ec56 SHA-1: 919a960cf92be710f6dfb9919aef6d4da1d3b993 SHA-256: 8bbeb89e1cfd363400c4a0a0bda1fd5871d1e15500535658bc14770ae7794a0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm and compromised CMS upload links suggests a tactic to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://milosislandrooms.gr/userfiles/file/bezixedumidavufar.pdf In PDF document text
    • http://studiomanzella.com/userfiles/files/vadubezumavumud.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/86838017415.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/guxinafefuzaw.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/pukijeb.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/puzorasotasupowuderimox.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/16753727709.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/simaganufajopereseg.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/30472993687.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlnfbhpjdth3qvgr64b65hqqs1/31448609586.pdfIn PDF document text
    • http://epmachine.ru/d/files/1378524251.pdfIn PDF document text
    • https://agatanorek.com/files/file/62862255868.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/bewalolagizab.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/640524878.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/29191412671.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/83dbc546ffc2e9a417a191e8e826910c/6366000774.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/18612027074.pdfIn PDF document text
    • https://ebooksweb.net/files/file/beneviga.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903123016.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tetakupivolimo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gakodonavukiminuvixe.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kukutiwe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0d45aac85288676a755bfba16f14a61b/46616589056.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109061404171943.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/50121740755.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/48c6802bceec0dc9b5f1d50c63fd2905/jifozol.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisamufuzoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=exercises+in+english+level+h+answers+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_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 16028 bytes
SHA-256: d74d4240e2a80ee89771956403764bfe0b0b294c9f1c3aaf2e13367553d51a49
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10916 bytes
SHA-256: 6bd83f7c0e3130dd0ebe110bb43ee3de4f570cb89e3005fbca4acf35ea79361b

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