Malicious PDF — malware analysis report

Static analysis result for SHA-256 839bbeab8949b047…

MALICIOUS

PDF

81.1 KB Created: 2021-08-15 23:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15f970a50016b5adbb3f95fa99d0d9e7 SHA-1: 69b11482af97ee682eb900ec88d1c9a66844d9ef SHA-256: 839bbeab8949b04733e25827d990201d1e800df35724645ee1986c82e40363cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for gaining unauthorized access. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting suggest a link farm designed to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7b054a1eb---13689713042.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/48733342754.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d49f2100e---43162933869.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nikotuke.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44455048092.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160992b9b10d00---gozemomagowaladowogefurod.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/90250536795.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l7b23tqh70hv10ve4q1bbrt4ls/40204374660.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099b58a608ea---vidafokulibuge.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/89063ee6276bb955be9ce47e65804ec9/lereden.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vikomekumitepolexumipek.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/folutuw.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/wuraxetamamefulo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/77007965096.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/mevukulefubi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ee61aece6f1---fomorubol.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63246e554---41453384429.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/galapusuniwa.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/repamesevawa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd8ecadf6---5031083343.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070df4bee150---34009314941.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160919c3fb64e7---retevumesikezegufupe.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/risekoxe.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/82430812243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2015+%C3%B6l%C3%A7me+de%C4%9Ferlendirme+kpss+%C3%A7ikmi%C5%9F+sorular+ve+cevaplar%C4%B1PDF link annotation
    • 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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 20108 bytes
SHA-256: d03793336e3a9197636d4c78289c06d38c486d3ebaf61191865923c7c976e693
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 12100 bytes
SHA-256: c7d6b8b8e6ceb72ab68d61bb8e8308be90f0ed3e1ddff7b7ca1d5a6ce43b0645
font_02_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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