Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b0b36e46380309…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 17:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b48a509be55399509573c94ae99eae76 SHA-1: c3ad4beb30de085959437433c1439abd11485137 SHA-256: 38b0b36e463803091f6d3891d5da5685af202ec294812aee36784f60fa7e9322
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 CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://iproperty.ae/userfiles/file/lopuvinagika.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/86559308528.pdfIn PDF document text
    • https://allianztc.ro/files/file/43603508205.pdfIn PDF document text
    • http://ore-processing.ru/d/files/72724401299.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487c271f0ed---zoguzawefipajetereliwera.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/62357763805.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/4363716330.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/guroleworizon.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/40322569156.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/nakinonakibivasugut.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148025234dc1---bodaxuzezokukutubevesu.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/fupera.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46209574299.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/63761507270.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210919_162036.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78621730b---sefofaxejak.pdfIn PDF document text
    • https://12shio1.com/contents/files/famoz.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/28284661633.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jowunabelafefumud.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/39588751608.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/loguxogerigukax.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8dc61a9b2ec0df30d46dba0c98c9a2fb/maxutuxukevitinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=magic+ios+gamePDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 10216 bytes
SHA-256: 854612efb4aeb529d7d1557b946c5ef6eba37e115fb96751376167b974f93f50
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 18360 bytes
SHA-256: 411d3c188545e6bcc0e45273c8554f48d5f648c4545fcd857b1bc5f40598320c
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1