Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f35c1f4796b50d3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 22:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee80ef21c90049cd677ffc591de358f5 SHA-1: be24818ccc6d62dd26dd07933ca00809b6182042 SHA-256: 9f35c1f4796b50d38c78342a18c5e6de96e0b53ba58bfbaaa70f8121b900953d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=zoll+r+series+defib+service+manual PDF link annotation
    • http://dobrasekacka.cz/userfiles/file/11306194834.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/10195263176.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4a2adb2e957aaec9ed5425af6472a9f/loponubofojanuf.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c439d4df---15131695762.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120e7b363473---rikunidibit.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/86923243415.pdfIn PDF document text
    • https://coatielectronica.com/files/xamapuseti.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/doxuwupusuxa.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/62818252854.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/537dc1dc9403e63d3f67f6e54ecb3018/sudipupuxofo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/83fnm4aa0ias2jagc26fvcd550/26300618389.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/bobewugalotoxoxevobuveme.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/n318i8bnad99stpguct2e30ubf/1576995118.pdfIn PDF document text
    • https://tomas-music.com/contents//files/11046929877.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i257bssqa5pid6rvpmg1nl03i7/jajuvif.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/99240032152.pdfIn PDF document text
    • http://greenbrier101.com/userimages/62180771689.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f7f8e98572e0ad7b53dc9c6784158ccb/lekiwexo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/263f349c052314f359b3844fa09e56e4/tunonixa.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/71547376491.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/fokugazofupunaxoge.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/44571391381.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/40a320b2113df71a46554453400516d2/70783869974.pdfIn PDF document text
    • https://esz.jp/img/editor/files/29396393410.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/37237690889.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/20125808873.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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 10808 bytes
SHA-256: fba5b106a3aa2aae94118e00c60d7976552a4760b56a4adeba703d4519f5602c
font_02_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16864 bytes
SHA-256: ff787d2dae81a460e363b7e2a3ad5b080bb5da1fb27727dfd3d6d2ffe6f8089d

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