Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb35a71a8170404f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 22:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a131ad8b18a011f3eb275ba03417ec0c SHA-1: 26a887c0afdcf8e1564d498850a86dd4461f5ba3 SHA-256: fb35a71a8170404fc14a16e8975d32e19f29c3b1236dc492bcd03e372ad37958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pergamine.com/ckfinder/userfiles/files/defuniliwavipo.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/88129880633.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210909111306.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad5c6bbe1---fesulonutabu.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sevarabem.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146286d4cee1---vipisedapogomodurisulobu.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/42765086493.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/59484934121.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/sibibiju.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/miwajutotaja.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/5069276000.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tidowasudemigobanu.pdfIn PDF document text
    • http://getvisa.ru/images/File/66474285045.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/87338019825.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/12758633684.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/gesifovibinu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mefamuxazaba.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fetipagojipolej.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/kotoxururuvoxaramix.pdfIn PDF document text
    • http://innotack.com/userfiles/file/89556401945.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/73090880004.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/722296b5aed7d923a8ed1bbf6c7731d5/76148699013.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/68257766652.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/wiwixaki.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/fawegowagororotofo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9281c110---87700631155.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/revidanexegugawitikefub.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/xosubapepazalomigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=theme+analysis+qualitative+researchPDF 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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 16436 bytes
SHA-256: 6c603dda0d053037e0a7d3d82fb7ba31e27e4a51e9b981d6b8fec9f1d092a0cf
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10764 bytes
SHA-256: deee39b1be65c9bc2c254cf459b194de635540a1acc12a528e69837676b836f9

Open this report in the interactive analyzer, or submit your own file for analysis.