Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a5799cbf80fc09…

MALICIOUS

PDF

98.5 KB Created: 2021-09-08 20:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49683392ebf6c98941e503d00b29452a SHA-1: 13ff7ac99e9521518a374741f678d91a3d229ade SHA-256: d1a5799cbf80fc092d90f9272a16eb9bfbec520f9d881509669429e21ccbb982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dionysius+the+areopagite+divine+names+pdf PDF link annotation
    • https://gallerylingard.com/uploads/file/sevafolojuzolal.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/40862121169.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/makotigopadepevixo.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jozak.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/44477160000.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6e5b9c3l34kck09ap7a600th7e/39985139508.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/95388108533.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97441801344.pdfIn PDF document text
    • http://renknh.com/ckupload/files/vitazifovod.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f225a24585---45610917456.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/93782894908.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/siwuxizedesolafupapaxotu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/92814503303.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138210f45e35---walofejategasatazuduk.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dekelu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613078aceb573---68360583778.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/26474546839.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wasudapuwe.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/48036655343.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/zadupusibikemuwelagoresi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/63226362314.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/25291325780.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/28536090671.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137209c95b21---tanolijadetosezixo.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/buzojewozegi.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_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 21884 bytes
SHA-256: 2cc883eff4e14785f32e86d16d20dcb557170c0602b7813df6a38cd7c7b56569
font_01_sfnt_off000149b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 11180 bytes
SHA-256: b4e98b470a72595097a98c1943fcb4dd86f5a8879c328d9a72e96a9e6fd6c5f6
font_02_sfnt_off00016388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1