Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b670862f1c4110…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 20:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e79c33c57f9e518eb1b330849b69953c SHA-1: 6af3d72cc6fabb929a30ee1e44932eb71f40e874 SHA-256: f1b670862f1c4110953e73be5a95e1795f56fc9145c6c954d7451a99f8220869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=my+download+tube+download+movies+free PDF link annotation
    • http://idominjazz.com/fckeditor/userfiles/image/25346649768.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/13091486338.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/gupenudulaxixola.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/30625357065.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mb3drv8s2r3q7ds87o0emedsa6/15531223889.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/79045312293.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae237bebf---tuwin.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113cf3c7b1---7452811565.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/22497749739.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lrlmkm9b6a642ngcol9tv4fc71/golavivatowiv.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/52571082408.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/momivazunezajowide.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/11821313057.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/pemuliximimonalotu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17f8ea169---kuwakowozawovop.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/33471086557.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420844252f3---vazurudekupolijikibon.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/47195141408.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/66936624284.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131882751afa---xideporesosavitefebixe.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090516211572.pdfIn PDF document text
    • http://aven.su/userfiles/file/depukekozurarigabufako.pdfIn PDF document text
    • http://lagrupacio.cat/file/7972185563.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/86028618430.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39813222597.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 11016 bytes
SHA-256: 8588505be91c6464e9926826393eaa6d94514fedc42f62d107f82c654d0d735d

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