Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd6ac977f11346e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 02:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0c0312c0e8f34dfc3425300fc252dbf SHA-1: eae3f8f7a538a5095d2f6bde10eb8d3691248049 SHA-256: 3cd6ac977f11346e48408c9beb2cfcb660a6d9ef97f8bb99adb3b3196bb2f257
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to a final malicious payload or phishing page.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6804a39489---kerebenabilamewen.pdf In PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210630173137142108px0pk.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160879361ed2a6---41709093585.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70df718a7---46091512403.pdfIn PDF document text
    • https://people11people.gr/uploads/File/90189909647.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03c52f64b---63791202664.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a6271e4e061d51fd2d4f4714883f362/46838315141.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/18166159472.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/17862688830.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/zivetivuxukoropukuwonure.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/lizufuwa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5f5fa0162c603b6e25203fdd21c034ad/wadav.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102e25153bf2---nirekeluvedowibawoloka.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/17810302497.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/27847e5cee7cbefef296ff33927ea977/24909132126.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a790f546d6bbe39c3e4519e3c259ca55/dowidokimiliwos.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d186e611ba95fb03d442f725bf80b72e/novaxinidekiweka.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/38522010801.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e070d65d8d---17531097949.pdfIn PDF document text
    • http://nktrading.qa/file/files/nuburasidugobika.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/5708403334.pdfIn PDF document text
    • http://geasit.it/userfiles/files/linufepuvepovakezipoxo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/93155962165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=atlas+of+emergency+neurosurgery+pdf+downloadPDF 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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 16920 bytes
SHA-256: 494c1f23e51b81d38794ba822d007f78a679bca34319a0cffe045ff58f188981
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 11152 bytes
SHA-256: c61b66aa0e330b617047f70534956b9360e5fe00b6028be7e10ece5248da0b99

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