Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194865055ab6b4d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 15:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3742402047cd356c7c19b61f3805f393 SHA-1: b045bbd873f089b50db6d0e4b00958cdaa85c7a1 SHA-256: b194865055ab6b4d59e337a6e367a6e13bbfd7decfefa76b12517642e4c7596c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised or disposable domains. The presence of a 'utm_term' parameter in one of the URLs suggests a tracking mechanism, common in phishing or spam campaigns.

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://philabc.ru/uplcv?utm_term=123movies+websites+free+online PDF link annotation
    • http://shop-exclusive.cz/userfiles/file/82670300066.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/49819559576.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/53495275467.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77c4ae3d4ce70d4cb7648fd99827a605/xedatodazi.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/85154696322.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/fuket.pdfIn PDF document text
    • http://micruts.org/userfiles/file/bitujerozefuzogalipitu.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufomim.pdfIn PDF document text
    • http://punaide.com/userfiles/files/70286439106.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022542.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/ligagebonajipata.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/tisuvukij.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/lematigokixusunexigalazep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe717e7edf---6502565141.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/5906042244.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/24496364372.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/538ea2fa67db4538a6234d498dc2c7f1/65323720068.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba86ad9625---72797361917.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/40016043892.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613373735900a---29268024455.pdfIn PDF document text
    • http://hejia-ele.net/upload/67304894349.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/kiwigegavoro.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zunepamixururus.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/59217333797.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/23485778924.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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 17408 bytes
SHA-256: e47115f761f1a44e67d0016481c8354e48d4a83ea82e8cd474d135a188095912
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10752 bytes
SHA-256: 34618b0d5c3c2adc9f2c7e43499704aa0ff4701d22ff9384d2186c31f5535ea1

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