Malicious PDF — malware analysis report

Static analysis result for SHA-256 1749c24b0bdeca5d…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 06:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e7e502ddd70806bf7b606300d3f917 SHA-1: 41690dec76ed6833776d3fb5e73f53de6926a56e SHA-256: 1749c24b0bdeca5d7c2619dab6691910c2681f68e1fddfefb7204167ffa1adac
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=how+to+make+fire+bow+in+minecraft
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/88674309889.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24d5fdf7424f11e1213d16483b67894a/gudej.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mkdthpcki61gdes6sm7p6qqr35/fapepimupabofixal.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc93c4a09c---ziwakinabuxipik.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/nevopavavin.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xatekosewofinopakeko.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071383d3b43a---66908928984.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/11325164013.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d186656b915---38801509526.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3b30b4dd---palififevutak.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48e2c34e---veradulu.pdf
    • https://mfdesign.hu/files/file/dulobawojagupigijawot.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/34292040685.pdf
    • http://gioiacompany.net/images/upload/file/44196743517.pdf
    • http://tuttotop.com/userfiles/files/89301741808.pdf
    • https://kaptenhoki.net/contents//files/firakarub.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8b16b3f3b68472442e0dc64165d8bdc6/vogitofaru.pdf
    • http://beergolfers.com./blog/images/file/pesuxedowe.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a3aea9aa---kivozusaxifiker.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37ae2868c2---jagipirevovufon.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/li1qi0jvms3kb40mem3vufjcb6/18395142553.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0e1olunqoca72h991262qj644h/rebosele.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7f4100c7310269173b8f35c7d372c2f7/86112862077.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedf.bin
86f69b09e06363577e051f406e1e53e41c7892eebd04c41abbd604ebbb00ac45
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 10592 bytes
font_01_sfnt_off0000e70f.bin
fb8d4cb5f6ed158f797ac12433aa4294ba4a04a4cfeb5884aa59879f40748adb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 17532 bytes
font_02_sfnt_off00011592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16792 bytes