Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8586ec49a14407b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 21:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1986caac634145464b95ede8ab32a786 SHA-1: ce569ea3cbd7abb5cb7ae8e794ccb71aab46cfc0 SHA-256: c8586ec49a14407b468f3f5039feb1e1a29b2036c545521cf61a9b9a066e1b2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lead users to phishing sites or download further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=computer+memory+size+chart+pdf PDF link annotation
    • http://tks-forever.com/upload/2021/06/29/file/85202901274.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/08fd677d235d9ec4a18404b86ed9d0fe/42767947136.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/97583762790.pdfIn PDF document text
    • https://tpk-m.ru/files/file/78458745849.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/zaxidigifi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/lugusanadizaw.pdfIn PDF document text
    • http://clerus.hu/files/file/botifobegip.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fusoxetizojop.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e82156e43---regojunebumipibuwexokizam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0f1e56a4---woxagojabav.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/97488470098.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/zovawujibopetep.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/vexopuxanevomuridigezuw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dea2128d---geniwudumitadoluloj.pdfIn PDF document text
    • http://skrn.cz/pic/file/wusufogizaborajekunega.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/11021358572.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e88ee790fb---88530879900.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letedazenixo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161322dd63826c---vibuxinageburoxibaroketi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb706a5c8---lanivezedaripiwirubo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106edce28e18---32527481903.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3obq6avmn723p3ehjitq4ljpvv/ginijebeminawemonifafem.pdfIn PDF document text
    • http://mlight.cz/archiv/file/piketejujuxirenux.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6b1d3a90f8178164f56db7031d437b67/12151151058.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107260846358860.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afd82e7558---63133517767.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/638ac2b801e2fbf6b68c7b2742686d20/62380113512.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_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 17300 bytes
SHA-256: 11ad95b87185f6228ff6797ec61b5d0082c2a69a02825effea7ed46a24ec7807
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 11040 bytes
SHA-256: 28f0cde8db069cbda74e59685c6d370770661d0be154252bc6627c76206605ec
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.