Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c917e0c3e95fb56…

MALICIOUS

PDF

100.6 KB Created: 2021-06-29 10:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3527b59c0615441028cac3d51bdb7ae4 SHA-1: 0efb3f5e6afa93458264f887e6f05125ee2f5e66 SHA-256: 3c917e0c3e95fb561f6c8d87b14e14d9e98ccba161f3711fdfc735de5f8d2740
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting other PDF files. This suggests a multi-stage attack, where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa3f92ec2---sonamimomaruwaxekefa.pdf In PDF document text
    • http://leton.pl/userfiles/file/liludafaxiwodifur.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/59487312fc9946313790341f3197dd0c/10546624281.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051915072973499.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eec2d2dca---37259391095.pdfIn PDF document text
    • https://studiorampinelli.com/file/98505890311.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1daba45ede3c9a21333979a6320ba2e3/81956030453.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6824d6dc---73555211259.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/17730540545.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/af901d421b416ce6781fb01fc03fca18/rediferuwegutat.pdfIn PDF document text
    • http://gtshotel.it/images/file/vuzovewu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5cf5b4cc---60134812292.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac2638f0e---gitixulefugalotuto.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898c8c87de6---99365439068.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/52200011498.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/73c4ed59355408c5d3fcfc6d0859a2e5/kasivor.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/be5400df711480cf6fcb2c9e293817de/15143173616.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/kariwoxixenutogonugemipok.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/69660061310.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0sd5humbudrjllljh6ev1f1hud/35756678101.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xerikapobumaliximiti.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f82105bc0527f7856ec9894c8dd3a676/filarawixafigetopapev.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b7968ba4b7c95f3bd1890d33909f4542/dezorawogune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=to+be+linking+verbsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16864 bytes
SHA-256: f1cd8ca69072bccf3a257c8283b41a5ad5873a42831701f1b6bb33a9749e8ca6
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 23588 bytes
SHA-256: a27ff3438cd0016207f9af8094523796ac1b7c62e6ca088830ad9f78639a2adf
font_02_sfnt_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF2 10284 bytes
SHA-256: b94daf4af09f354a628754f50fc647685046919f134d7f7bb04655e10315d87f
font_04_sfnt_off0001762b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762B 3344 bytes
SHA-256: 65ef7592b893f7cd7f35ab6e3c2e81ef00317243baca6f332f3f6d3b4dbf0067

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