Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3b908e867eabdb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 04:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b96422f05e6e72193a04c054d45be51 SHA-1: c5de8dd0504bace27f18395eb14e30757f374406 SHA-256: 5d3b908e867eabdbbf85e2a7525f0435578bcd9c9943d7a208207fa5b98e9f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document structure suggests it functions as a link farm, attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=nice+adjectives+that+start+with+f PDF link annotation
    • http://wisdomtours.net/upload/file/85345136360.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jewiwafer.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/69002336619.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/sopegugaju.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210905205820.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/gitezufuvefalupa.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/99867059131.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b5eb63d8403841e27100e1a8f1253c5f/68688051694.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/todalimipadiwogadekil.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/nusaluvagopefo.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/72225543399.pdfIn PDF document text
    • http://lovesenergy.com/file/30846665037.pdfIn PDF document text
    • http://chromavials.com/d/files/petadida.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349450d7413---rofotonirasugole.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/33989323762.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/43363999317.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tonifurot.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/41578765089.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/bemube.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091715532973499.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dedadikotekadulowo.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/dotobegowowijasokaxeni.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/70417336721.pdfIn PDF document text
    • 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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 15460 bytes
SHA-256: 2f05e024b9a436889f54b752380471f1c1d7f0933a2ce551a049ca0d1fdfe921
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 10564 bytes
SHA-256: adc531cb06c38c196f225e4e3131f220175745334a2c8c8a6fa95e8daf416259
font_02_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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