Malicious PDF — malware analysis report

Static analysis result for SHA-256 c400f3ed874994fa…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 11:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efe733f8aab04409151ecc393f10a7c8 SHA-1: fc9d441baad7810702ed75faa93fe806059ecae6 SHA-256: c400f3ed874994fa4e09f73595c9b4b91147e13d1b8178bb3fd2f706ca50603d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/cafthgjjch8jkbvjsuuuubd80u/53034560174.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/busudujevovufugadeken.pdfIn PDF document text
    • http://mfahk.com/upload/files/4074818345.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wuwalavo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/25054821817.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4b66f918---82885811484.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/80900671387.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e119d673---56783576182.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/gofamewuv.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f03e0cc9---45053720132.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db2661baa0---47238795102.pdfIn PDF document text
    • https://laser123.com/geektic/files/padawuladep.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff34ffc35bf---wagopinumogalesakijafiti.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/xudovuvitimewoxibuk.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1bbfcba1305a2cfbdca1fa285da4c67b/daxibovoxesuto.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/22387830391.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/14778666784.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e088505932c---12077609884.pdfIn PDF document text
    • https://kaisar168.com/contents//files/47457072531.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210713190731.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1qofp6qmd237ltf4jj34bo8637/58874675215.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f423cc56---88917928118.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5cfffde822a2e93427d2620ff26e1f71/82547379669.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b191db3dc8d9e7ac97a264b68527ed26/rizore.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/9131889149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pathology+of+breast+cancer+pdfPDF 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_off0000c06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06E 11060 bytes
SHA-256: d03eef17777ebd709f2d32d176b0ac3d8afbd7d6ccd0041e681705456c13884c
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 15624 bytes
SHA-256: d2e29a24216ed407dfd3527edd4d85406ad69c010431a5b0a6b2f74e0c687e8f
font_02_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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