Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b90eafef7e68b5a…

MALICIOUS

PDF

96.8 KB Created: 2021-09-16 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f6406c998327af5a5c71c1c66879cb SHA-1: 12ac5d2dbcaa4b780643e3e94ea85e0b3b6e3739 SHA-256: 3b90eafef7e68b5a943ff2645ff9b526482eb2962409a30777959ea4beb5c222
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The presence of external URIs and link farm heuristics indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://njchemland.com/upload/files/nukulurupak.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f13775c5b---64651399526.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/25278945581.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/51169654918.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/51323700283.pdfIn PDF document text
    • https://ratosatu.com/contents/files/1732480035.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc045634---701973447.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/51004426134.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/96039941935.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/37616631189.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/64cfe2e4e0f798778cb5cab6f8ffaf90/tufigewepib.pdfIn PDF document text
    • http://cascad-trans.ru/files/rodidub.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sipawetojibojeg.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/jipomemobuxunetopiwanu.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vojekonezufukarozorutenof.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8ddc609f---tobop.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/92794876656.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25830419954.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c2841db1a8081c1f97cae9922042bae6/52775706720.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0bdkgoice2g7njf8678569q6d7/84884384725.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/samofekuzikusezif.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tubapowenebaziremot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nitro+nation+drag+%26+drift+car+racing+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_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 17744 bytes
SHA-256: 8370f504f5aeae3025588a87ae131bfa1eaff7469ef23c5169b55f327174d968
font_02_sfnt_off00015f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F59 10052 bytes
SHA-256: 7fa1c9a8159bf46aaf84656c6581bbd223dcea7bff85e09bf6f1c86f4068c73c