Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0ffd5c3f5be18a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 22:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 30df6b0a2c9496275379ee70b1c0d899 SHA-1: c400ed4b17295fba46d18e5c39e498ad5b2cc780 SHA-256: 8e0ffd5c3f5be18ad02d5233c883c522d42d02e48da92a4601a4bcd527816377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being part of a link farm, directing users to potentially compromised websites or phishing pages. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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://medvor.ru/uplcv?utm_term=snaptube+apk+download+version PDF link annotation
    • http://nasfthr.com/userfiles/file/13294861856.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/46083152350.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77ba6e8f1---datupuwigokedovagukipij.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/69793373146.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gujopidakenaru.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36534129177.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/69753659570.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lenubesorodabanarapo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161321c03a6e5e---xigugene.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/96515640398.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/vafaridaluxana.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fafin.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/32050439033.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/migibugujerunodoxin.pdfIn PDF document text
    • https://istanajp.net/contents/files/latowovi.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/pelabowunama.pdfIn PDF document text
    • https://kar360.com/resimler/files/doresesosoregomite.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bedef5ab49f76f52bf63fbbab64fb153/jipex.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/deguxefubavopowenijovolo.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kozujijaritobu.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/19985386218.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/57e3c779feaf1c2fe583a28c2808df2f/nupusomaj.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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 16432 bytes
SHA-256: 919797bf4deaa207bdf475679e766e4cb02306423a76aa1e407dd340963c0fbf
font_02_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 10944 bytes
SHA-256: f86a8b9566587a11c4d3ea265a35ba1463dcbd3b77f9e10a28df546c6205ea5f

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