Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbf6704b6350ff5…

MALICIOUS

PDF

89.8 KB Created: 2021-07-27 12:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcaf05268b2ed7ffeff5aac7182c41e9 SHA-1: ba36add579e02054b283b48e08f45da4cc743db3 SHA-256: 6fbf6704b6350ff591b21823bd0bb59731370507e250303ff34237066ffe8359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://idd.no/ckfinder/userfiles/files/6191264899.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sjetsvj22b131mpv1ig65lldg7/buregiladime.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f8d5c667679a1b662cbda52130b299f2/jinisivu.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/vilitukalirelumu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/kananegarumabetemesusoses.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607323661cb1b---xewavurilexeremog.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/jorotodolob.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b52e31f7---40327209262.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/38657743392.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094168d04099---witeg.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dec77e521b11125c3a59a7fb40337d14/besofo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d735b4da77---5778809969.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/55380451324.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/25137576022.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/702d97066df4e698d979d7b859dde2cc/34896460224.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/radinemetetiraxigiguganoz.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/36g3n10at901tjt23r304r31g6/dotike.pdfIn PDF document text
    • http://merwepizza.com/upload/file/30775386460.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/ludafakuwijexajemodedexe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e259e250---28040325236.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210618060152.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/19154583782.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/52276134066.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f1c726e8---zufewikofiv.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/66236891254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=can%27t+add+email+account+androidPDF link annotation
    • 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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 16472 bytes
SHA-256: 942554ddab675d39b0b26daf2ffe7bea6a9863e60ca8b953368309d96ec55a5b
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 10528 bytes
SHA-256: 5052fd1e09f3cef884d4dac4ea51f6defb6742170c92279de944ef2fe584c6e0

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