Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ed3265f627596c…

MALICIOUS

PDF

59.4 KB Created: 2021-08-29 19:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b45f333baf464da87af097f2cf6c56e SHA-1: 814de6cf7fa570bcd0bfeeb827bd74602c055fb5 SHA-256: a3ed3265f627596c889889238f376aad88e4aec0629b319e69f149e3441e4d21
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6242

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://abwmountvernon.com/uploads/files/xevarax.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/672f9f6da27f43fff51b45aabf93f7cc/77409710388.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb6c0ff3a---58635562502.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/2926073553.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/510a9d3e6a635cf713175363b3715fff/buvugizoko.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/jerafaz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777288961ff---92381657687.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/38031273244.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d237e1c10---73384442846.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72252793156.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vesoxaxenupuvul.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/suxawemi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/likelevap.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d543f842---zegagakevopoveke.pdfIn PDF document text
    • https://marigabung.com/contents//files/58456819929.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5167v1462grsiej872n0uiubbu/zipakidixisi.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628377532_c5390510be.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/67513308480.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/41f96e4f45aaef8be997d6c0d8f402c0/selibuzijigavaveb.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/57282149772.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b0b1agrbrlq6hejfhd637drps5/badunus.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/93226713282.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a080d0a84---21315544396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tracheal+system+in+arthropodsPDF 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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10856 bytes
SHA-256: 811439ed441534199d98e18be9348ba52fe08d94fb19a8de7b7cc3f035f313c4
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1