Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b29333dd9321d8…

MALICIOUS

PDF

87.0 KB Created: 2021-08-04 13:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e9edb110c42ba50113e67b4a9d8833c SHA-1: 5466226bc523b4851c17464ff4b1a62c5c420af3 SHA-256: f9b29333dd9321d8994f5fe83bd6df4d9e4caec35aa1506b6cf05d635901f79c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/176a6345df2bc38a97d2adbda19ebb34/428077474.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/gufos.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5ghc320aev4okisopb2s54te9a/51848038650.pdfIn PDF document text
    • http://tele-video.ru/upload/files/44288414070.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43178c84d4---70034140086.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/803fa5d2e88321558ce93e269fa68f49/kamedilonipa.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/geritamajazadegikowowuzid.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/n969d29n61gefceutilpov5ko3/57263791239.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/pikexuj.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d69d34496---78781776147.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/duxoxunafozot.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tiroromunoleta.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa0f8f706---zurorosolusibiziv.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/81234766624.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810391003d7---nivovesoxogozapuke.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/vavebefizorili.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/dufozigugigamenelirawono.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/1731807817.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/92750937348.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/zofevomid.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/legadid.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2b9b2868c734c28b6bc1c0138f1f84f4/23920472972.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/18713046218.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627766183_1be5dab115.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fubaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=g%C3%BCvender+ygs+matematik+soru+bankas%C4%B1+%C3%A7%C3%B6z%C3%BCmleri+indirPDF 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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 11852 bytes
SHA-256: de0527b1b94243f8b3cfda88eb270b20c419e2354722b1716cc8d1308fee2d45
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 20392 bytes
SHA-256: a3892f3dae5263d845fc347e07a4e205b582102496fdd933a96b3edcda07b892
font_02_sfnt_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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