Malicious PDF — malware analysis report

Static analysis result for SHA-256 af418971d8e4f397…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 14:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd01ecf2fde68e090521134e7bbeac2f SHA-1: e96f9e484338c25ca041d3d98ef5e68ff23f7b56 SHA-256: af418971d8e4f397b153514b5c35af56befb1b660a005b8e7d788a058b80af1e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple links to compromised CMS upload directories further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

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://kursadowicz.pl/Upload/file/40111633220.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b8d4e7e5---retejisixajavule.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/rujidib.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/8107954519.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/62780443028.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/bafoxifabojimikimebiroza.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/18c51a18986f650d9e47c4a7bba94f7d/65377452942.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/oat7bnl4pq3h7nndh63a1q3v10/25434626152.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0335b819---vurut.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2997db3fff9dfbd34fbfb223665b0b06/roxirizuvoguwija.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/pinesulafezebug.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/62507655552.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wegapiligob.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29e3893fb376b8363c20918a4c37c12/xitisumonupaseluzepoz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/volas.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/zuruf.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/60976820982.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/jepadukesefekofedevi.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fabuwefave.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zorimakowidanogodi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rulepimatus.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/97962000474.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xopilipisezokepitulizib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bolt+nut+weight+chart+pdfPDF 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_off00013f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000157a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A2 10968 bytes
SHA-256: a915ac365090609405182a75ec2feba86541b789332ab37a202d1a0bb5f0dd03