Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61d14f427dbaf0a…

MALICIOUS

PDF

83.3 KB Created: 2021-08-25 10:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9891f21971250f90e6e923d4875ff945 SHA-1: 682b827d1de1e16a83d73a18c3481b61553c1c8e SHA-256: f61d14f427dbaf0af2a7ab763e24469980755cf9096d82e92ceb980dbc13c190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4510ccd5d0ccd7ca625393ac91c61367/vuramumevofesuzulerar.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/2512139161.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/25979360636.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/zapumolemegamalokekom.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/74732225702.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f28f30fb2ece9ca71b3134a1dada1a7e/luguvamexixav.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/golixopupokuzekejepi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516a6b574d---meluwuwebonavud.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4123a607b2ecbd1d89bac9b88d2801ec/64145650041.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/renirugusovixerasa.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/rowakitema.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/dd4d8b1243e7ec9ff15228b65770be0f/51789743570.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/830d7a27903510243e99f67243310cca/nadutetijikozitudu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f05b36d28b49b3c022e4c76244c43289/78399928294.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xesoropopar.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/67272631272.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/99349402421.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d6864207---94736560175.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/zigawonudosaj.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6fa885b95a1bc238f2fd15c4b40e8bcf/zitode.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/jujabonabusukudeluzabog.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/51860071167.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jekajunipudozaxan.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161155401de9cb---wepizilinamarisorelaxo.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/4752095378.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/06e31caae2b577027b20b9b90a404377/48354072307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=helium+app+sync+and+backupPDF 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 18204 bytes
SHA-256: 95f3759c62e89b3e7be0f67b76e4deb92c1c18f3bd46e06db33146564105a075
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10792 bytes
SHA-256: bd0f13c0105ed76934e7bf8f54042ff56dc1a2c311c68e619ce602a279e90fd9

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