Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79972947b00096e…

MALICIOUS

PDF

63.5 KB Created: 2021-09-02 07:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 717b45bad078edf37d131b4cb6c766df SHA-1: 05fa11acfabab6e5e7f0ad62290b2ca34358daf5 SHA-256: a79972947b00096eb179066f4fc0dad84c936613ed6d83c4aee69a20778abefb
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5713

Heuristics 5

  • 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
  • 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://zulassung4you.de/bilder/file/biwovafori.pdf In PDF document text
    • http://omni-links.com/7740547245.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c05b11492d9bafcc7d136803e62929a6/tolinujagajisulerukena.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/60759277501.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/vabobikorifijaxofufoz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4cb26567---83654800136.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/4180833212.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/warodinunenosigo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/16a158d62a40070de5cf8cb55e945f7e/titifewijibexu.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108190009115269.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/87602333215.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/t805sq91j5kqg8mq9tmbfmd21m/vokoken.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/6158889481.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/87212314268.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca08dd28b---susenawesenok.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xezuf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd96880eff---45522254839.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dubisomoku.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/totavewiriwopilozimesivas.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zedoduxejin.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/zegavatikapalonamopa.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/55029321595.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/m9k58mu20au9ve5pdvdhudq0al/rovigele.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1edb49c045c9c8a67f6ec9273074edb8/rusudalasitufug.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4b6a077f---68460148631.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/39970642187.pdfIn PDF document text
    • http://ledson.ru/upload_picture/regokuwisogoxume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+tie+a+shirt+knot+in+frontPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 10432 bytes
SHA-256: d1af64ec90912ea0f77b11d517453c890591fb706ef6dcfe6bbd58b17ce9d655