Malicious PDF — malware analysis report

Static analysis result for SHA-256 c706c45acac7032e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 02:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd2d9c913dc919de9b9e0c30e3771fdb SHA-1: 5254664a191b16fe57e15d1175f3c29c81523de7 SHA-256: c706c45acac7032ea34056bb565d0ce988edaeb124b9183b802f1552e57930fd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chapelguild.com/images/usr/76624710653.pdf In PDF document text
    • http://rambud.pl/uploaded/file/malurapagaruzamoxuveb.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041951189379.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/92510860778.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/goxeja.pdfIn PDF document text
    • http://wirheiraten.de/images/file/47139594515.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/fededinaviwetaseraje.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/55188192243.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/newob.pdfIn PDF document text
    • https://kaparatt.com/images/File/tobabodugawugeriruza.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ligelajoxakivarew.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/78954082457.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398f9edb93a---62654063462.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wimudomojasekadibamarabov.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/50512793065.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/88022039633.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/benosuzifut.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137666f6cb39---xeludedusubozelov.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/jagopefuvova.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9dd3ec23d4035cd826635971ff86ea4/petelak.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd97b7577---79217771290.pdfIn PDF document text
    • http://kd-council.com/upfile/files/bibuxa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tbqcckijpb43ths8qfg2ftd6g2/nuxatanibogamogivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=biggest+gdp+in+worldPDF 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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 10544 bytes
SHA-256: 2b6320a9b349cd0887d66a50cf6e999a6a8e38ae03712d72580ebdd219806ba4
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 15580 bytes
SHA-256: f8a6b595ea626ebbf61ca7b76e2608cb97b240b58b25eb9ea003396485e77885
font_02_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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