Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b4cd8e55d34d34…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 12:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bdd13c3f2030669964c8444c9f29a23 SHA-1: d4a9b118d74e6cd2378b6d94586105fca837597c SHA-256: c8b4cd8e55d34d3409444ef6e65e233d984a6881504b2f9b5338fc492ce54254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure align with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=watch+true+to+the+game+2+movie+online+free+123movies PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/kirug.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161432e9289b90---35197682561.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kuzutibukikobeg.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/wonositelidimo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/03ed098d2e3187a87824dea99a7a5fbd/mimivikuroradatedos.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/98524328203.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091302062380.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/350acc0fc07d4b0a0e577d5a9f8acf2a/fekavoxotogukegike.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/lusuxobimesitefonavuxonir.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/35318764708.pdfIn PDF document text
    • http://medrea.ru/upload/files/midadiwiradabusebegutamo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f868707c32---wibamusagedazubuzudulin.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/ponibagigajidakimafusa.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/75492033407.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/75488390298.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e41919827736e2c9eeaed4bdc9f56e2/66840084315.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210911051054.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/50783116457.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/67194583162.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/ronixevofew.pdfIn PDF document text
    • https://unitjaya.com/contents/files/89141728857.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161331de76f68c---kefipotedomomemova.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 11288 bytes
SHA-256: f67ae38e07b526cf4c2424f10bd168ff2d37edefe2ea7ffbde596fbca32444d3
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 19268 bytes
SHA-256: a0b2bf19f03b6cfddea88dd529d395e8b43702fe69d1acb348c4d6f22e55b36d
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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