Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cc1eb52ede36f1…

MALICIOUS

PDF

91.1 KB Created: 2021-09-15 19:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2e68f1137644b966937f36a4a4e6526 SHA-1: 906798b36ef83b1735d75811928ab1cddb73a29d SHA-256: c3cc1eb52ede36f14be2216dd56a53943bff87910f7c08e4114f89fab8c6ef7b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

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://catamma.ru/uplcv?utm_term=jailbreak+software+for+android PDF link annotation
    • http://imhkayseri.com/resimler/files/13633808634.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/rutizemililijapo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/bemosabisakufadu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/bajalok.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/16270586235.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/topofi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nokijat.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/764b8971325dfc8d173259c6c776a448/64008178737.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/84565296663.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/wurakepumizafuzo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/buregixukuwulozodivigepof.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95b17bfb---23103961692.pdfIn PDF document text
    • http://bscartridge.com/pic/fuxubemujunijodabufibofof.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/latala.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/33892183348.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141074f785ca---69809948554.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/15642494208.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614184842c166---gepuwerexarofavovo.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/89683779296.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lobowomosoborugotexat.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/migufemitoxixuzax.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76451429034.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00805f089---rebezekenipuruxozej.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_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10656 bytes
SHA-256: ac89531d0b846e700beea8196a1eb049e68d07a219c18c9296245421f177798a
font_01_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16892 bytes
SHA-256: 4a90dc20d2c03621c1ed57216477f4ade80223af43d4d19c5d05a040d6253f9d
font_02_sfnt_off00014745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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