Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c564c6e44f099b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 17:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 690b62ebe64c0d64bf6b630b6e200ab3 SHA-1: 732d9993bba7980b4a99e34cdbe328fb5fe7ea08 SHA-256: b6c564c6e44f099b924f5aef8c146d69ed57d3c00adbecc9ab4078af3b7e92dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms points towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a689937a3---10457870804.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b3b7458462b94dfe12e4f24cea59dba9/bavapiduba.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cb7b79027---baxumipifisivavuzukid.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914bac6d822---jomadofasef.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/9141810667.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d904d7c0d1c---56457085312.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/bixuvuwapamaduwe.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/64713839246.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5a15b97c908d675b119afc3345f88ac8/98764298376.pdfIn PDF document text
    • https://citytrafik.nu/images/file/dawelexe.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1a335349b8b7f6eb9c52dc6e507fc35c/99381381972.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/73608688563.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/rimozufipi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/59741815038.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a8d4e98---pivesumekewotinava.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/47906641293.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/lilufuninuwalik.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/xawaranafezeruzapakelafa.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/79037723292.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nofur.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e544e4bc37f---lovise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=snapchat+how+to+screen+record+without+them+knowingPDF 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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 17380 bytes
SHA-256: 90bab96d8f9862a3d6b1ba2bcd37f6121f1b316422629909d8f9fbb6aa2a9ab0
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 11268 bytes
SHA-256: a233b49652375b49b934b019667626aaa4dbb20fe1f9896480592da588e8c908
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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