Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a786e6af18b2d3b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 11:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9370ffe6cae84df693747bb7ceeedd3c SHA-1: facac45852909a39695335e8a0be67562b53f3ac SHA-256: 0a786e6af18b2d3bb3444c0b6cf8b48eeeca9874627a682ec619352831eb6cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous URLs that point to external websites, likely for distributing malware or conducting phishing attacks. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are designed to manipulate search engine rankings or lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=a+level+organic+chemistry+notes+pdf PDF link annotation
    • https://thietbixanh.net/uploads/files/bofituvogimajiloxetoni.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67942690422.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c36i0ak400814c4n7qehi46n5u/58622160373.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xaruvuwitexeparutanenefi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133188f77e10---nagirebadezufepi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/90858016025.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/wisorawe.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/3836079387.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/sigetevavidomaravadu.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lotatitezapireduje.pdfIn PDF document text
    • http://oilspecchem.com/files/wokogosufepuluromefu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138947b1962c---1900964824.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fesulorobulonoxalorajig.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/roxisavinatib.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/37256208782.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/89781389585.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/80052163266.pdfIn PDF document text
    • https://amgaa.org/temp/files/jenabedev.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/xudeluwakake.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xubafupifofakataredozi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613245308f195---donefimoruxuwimezowulo.pdfIn PDF document text
    • http://kelsenator.com/userimages/81553046863.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/90630254097.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 18216 bytes
SHA-256: a5f1ed5f83b719a177d3aa1f48a036b35c8ea24a399c315ed0b8462e612f5036
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 11228 bytes
SHA-256: 799fe706d29c985d31a271de45cda1828de55e92cf8fc4a70d41e12bfdfe9a1c