Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43351639cf30642…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 22:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3e24d6f4881cc07aa48d65a7bac445e SHA-1: c2de51c8302f912440825a2ba4d21dda9a7e1b13 SHA-256: c43351639cf30642a8aacb580ca667bcf8624634c1c0482bf98c44ce320de86b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or lure users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/09301d34cd58b37e56a61cc7b12d4111/26689890155.pdf In PDF document text
    • http://princeverma.in/uploads/files/59398756430.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ddb83a65---lelamajurugamaxovidefix.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/sojokebawiv.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/44409500205.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10398d0294---kasil.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/77669061467.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/70153914200.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zejulikenitidu.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/bujedisasap.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/fadir.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/lurepezivekanewa.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/377e9616beb085b3dcee70179443e30d/zitagepegoziwekevepixori.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m464lgvuj7h64hsjqitgo23d2i/muzavodonajiwufejoroli.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/44854857793.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a865c4bf3a4628d835fd675d1642a87d/29513906977.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/52077583454.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078caf4e005c---zimom.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a3aad9ea---72565131113.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69ceaff90---11889199778.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/383e0039751a335f23926457671424a5/velavofabikiponerubare.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d613b8c8b---jidoboxovodub.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6d9ead0b---sopulifonobalojarokorub.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40055506826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=music+is+the+only+thing+that+makes+me+happyPDF 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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 11020 bytes
SHA-256: e1e93c0fb0e5af0d7aec49829d856b83d12123663cb8b8e68bffc7bdea186092
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16884 bytes
SHA-256: 26643786c126695670a7acf614c74df50900399182cc2870abf933b03231e50b