Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de9aa76ff1c1106…

MALICIOUS

PDF

105.3 KB Created: 2021-07-03 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fbf0f92dd82cc3d46bcc966a48734f4 SHA-1: 474324b6349dec99ef6b2190b27dce79662ba372 SHA-256: 0de9aa76ff1c11066cdda0eb6aaec011482e2b8ab91a2635ea59b3bc13fb84d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/jh6g5oofitujrnaarde6gvsbep/87265903885.pdf In PDF document text
    • http://ibshop.gr/uploads/_uploads/files/dizegegenabasuvon.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/15867321260.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/gafupekape.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/59958971034.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/korabamajedetesoxero.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/46310752100.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/73931f2d70fc1a5fbf828c750d41a5b2/50526758007.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f490f89b09d37f47b74f67f8acf0f217/8872042610.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/70499211927.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/59893095334.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/mokoronuk.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ueasoob4te3d1mc4uvan49ao1j/tajimipujuxomuxadi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/75247121439.pdfIn PDF document text
    • http://polletnv.be/uploads/files/79810251779.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pdsvafil1bc4pa8ugk2q4thc06/33136440241.pdfIn PDF document text
    • http://www.toptehnik.si/images/73832712983.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb683ecb797---63843388356.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3tf2dfelq0trqq4qd2mqk2j4jv/vemefojuxij.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/93490594618.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/dinufani.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d8197cb5---lojokedolumirolakis.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/q3ovdi7f24k2tb3cf7fktvmmbp/9674615346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=scriptures+about+fathers+kjvPDF 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_off00013bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB4 16552 bytes
SHA-256: 099eaf2e9447099b13f712f41e564a6264bb9f65290058d4a6e065cc3b3dfb09
font_01_sfnt_off0001665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E73 11028 bytes
SHA-256: 58cfd95b6adc103d5f2ddb35b2eebc6e5e904b07a390a31df1b3cb2cdfe377f8

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