Malicious PDF — malware analysis report

Static analysis result for SHA-256 be759a4b2fe690ae…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 05:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 391a02d29723e3dfce2d0b14539d604c SHA-1: 21356b75790f9006a8564cb686a75ca1a995653f SHA-256: be759a4b2fe690aec526361743e080811b75c10d0d6261bb3e4e58c502b4f3fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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 https://pixomot.ru/uplcv?utm_term=among+us+always+imposter+apk+download PDF link annotation
    • http://contactfm.be/userfiles/files/natarotoniporomizibev.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/semorusibebimuvijag.pdfIn PDF document text
    • https://slide-bearing.com/d/files/vodifusanexuja.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/22119598023.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nidamibanenaw.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210902024724792870edemgu.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/55777706150.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/50940891746.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/41983245690.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/jazabojefojepep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a805c18ab---51870820171.pdfIn PDF document text
    • http://sinostandards.net/upload/files/67990253378.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pagazazibepadewomojizes.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37641407830.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/ritatesudamaxakeganife.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/30884201872.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca193fb13---meripedater.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/lufogokariva.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/pusiwudodinexovapakekis.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vegadilefu.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/kediwefemuwijuri.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319e66349a5---62118398064.pdfIn PDF document text
    • 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 11108 bytes
SHA-256: a10aa186c1ffab43c2fa036b06c5e7c73fa4a68a78e2f9991f09657c34605091
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 17372 bytes
SHA-256: 6d364c52c3b36b6f8ebe3a7ecb58b5c9887478dd2555dc4b491076b0aaf08e6f