Malicious PDF — malware analysis report

Static analysis result for SHA-256 37720207a6b3f268…

MALICIOUS

PDF

79.0 KB Created: 2021-07-18 03:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cb4f9f21e0e3097b4cb6be334c1a3b1 SHA-1: 49c79d6bc5b96b2537429046dedd9d15e940c3ba SHA-256: 37720207a6b3f268294bfaf7f3d2df39a61aa0f13515353b358b41009462765a
124 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://dafangtour.com/fckeditor/userimages/file/pefotigigipojo.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d7f33f224cfc895a960e2c41b9704ee6/62662755967.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6d7c35d5---kemuxejobosojejamojovi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9ddc2931137b37686bfcf96ad6f2327e/36859925349.pdfIn PDF document text
    • http://dgjst.com/upfile/file/31639727202.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/maxipixovitire.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo14nthmu8v99jpbipgoclff5r/mematalatotodepuri.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/45173678232.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e17aed7d---wifutib.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b38d79161---41030734321.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/filmf54p1n91b76monb7r4b5k1/fasoxukirizifotegovogaw.pdfIn PDF document text
    • https://tmtteks.com/files/fovusesalu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/91766940599.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06701aa0b---verexomizagejenesob.pdfIn PDF document text
    • https://ovalpolycoats.com/media/gutog.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/58408219665.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/15856866953.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zexutabowida.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd195243d---82116511883.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/46n3n3qdmd763065nap9tmbl36/12254723314.pdfIn PDF document text
    • http://vodnik48.ru/content/file/62218793774.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608992c6cb80a---radofeximazupuv.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/vavaxuxesenejupemoke.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/32483622993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mapping+in+computer+architecturePDF 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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 10700 bytes
SHA-256: 68e54003832d7ec486048a01dcf0a1a139ccc5f782a2b9f42d9bf6eb14f97c43
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 16764 bytes
SHA-256: 5a377b7dffea01ce11f7ab658f4cab7702172fe9319d3dc2d1d390315e503a1d