Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98ec5632222df2c…

MALICIOUS

PDF

145.6 KB Created: 2021-09-02 14:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9a5da2a6398ca675fe6e02f73a6114c SHA-1: 11a6a6d016efe5c049f1202934fdab0ea6bee1a8 SHA-256: b98ec5632222df2ce95b6ab2cc098a23d3d715dd01ebef208832eb39bc12ab12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, and the overall structure points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.1685

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3d8da99c912168b6300eda71afca4f56/zodufinuzudakot.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a9c2c616e3---pefutipirukanajozekepob.pdfIn PDF document text
    • http://w-mill.jp/images/file/topawodivu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5ca82115465b2c83e6d55533b6a193ac/11465499029.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/pavovudefitubaw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/psbohpgp67agnmnk7v5ki4di2k/24659467674.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944af1cf59c---wewonuzefaxitar.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be9ae7371c3---jufodelup.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/xogewasusimipawunelo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4dc74922---81142137344.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac824feeb33---zopagobulipazimas.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/19244499637.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fotupimaguvisuxigedan.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/11451588942.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/85414633100.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5c404a35---91107852320.pdfIn PDF document text
    • http://orderkai.com/uploads/files/58079561209.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/467ed0df4dcc743944f056a8b2f39225/65898238770.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105ca36789f6---dexanufogutanarivol.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9754080a1---xofebijipuwigosot.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/16591115373.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/fegegozupozesifobejulowat.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/80159756754.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/33924246548.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be3b087bb---83885605101.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42223209819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=six+sigma+for+green+belts+and+champions+pdf+free+downloadPDF link annotation
    • 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_off0001d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5F5 11472 bytes
SHA-256: 05a1b86723f79a4acf5c47b6cc74f26cc84b734fd4e2f740c0026caa62b95184
font_01_sfnt_off0001f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20898 21100 bytes
SHA-256: 0f40ab1859e602e427cd5f8c03d8c08ad88d903cc8b2b758a5ed0d5c6ce14779

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