Malicious PDF — malware analysis report

Static analysis result for SHA-256 b226b776cfcaf90d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-21 01:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9816999fa29aeaf64f4cc9bc66a82c6 SHA-1: f1329a4e7d3e883fcd23262266819778d76d2af0 SHA-256: b226b776cfcaf90d06723b42e0a556e09e338eced1fd4332ba97c97ca17a338a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=android+vidmate+free+download PDF link annotation
    • http://pegastelco.com/pictures/files/tolet.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430d2ea5f5f---wezokepemupelapazalevibo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/13460215106.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/56335617804.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/19577862207.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/larusezilun.pdfIn PDF document text
    • https://pindimana.in/uploads/file/4578517907.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/42863153577.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144bd8223d9b---39929966430.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/mipelositevagizolerimose.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/93300724750.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312e77c8472---sumupefewu.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/29820447516.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fewuzolidubi.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/49383340136.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/26463346241.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/99482002738.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/visurazemosop.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/19291179874.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/23905980630.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/80495121416.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/tixutafudepogimevarob.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/xavivosafu.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_off0000b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 10480 bytes
SHA-256: 516db123e59ae3d085eaec050672107d9eee68eaa6e146dbb424cc9379ee0900
font_01_sfnt_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 15524 bytes
SHA-256: e29580116c258c0a374c56b759c86efc725e2ad917dc71b9c31821527e79572c
font_02_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1