Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc028c33a2224c0…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 10:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc9d489d19988fd24933edefd0bc81c2 SHA-1: eebb1bd6c546c544999269b6a2d5b95a1bca39f1 SHA-256: 4fc028c33a2224c065115162edb2f0811549bd7477ceb65d51205e4d13d0bcad
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that appear to be compromised or used for hosting malicious content, suggesting an attempt to lure users to phishing or malware sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://go-forum.cn/upload/files/36017694501.pdf In PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/puvoza.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5153fe02b8190eb894aa909e0f87b96c/51254026082.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac48489713---81422936056.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bd8243c686a0d2e01a647ee9e1f5b853/potevezoxek.pdfIn PDF document text
    • https://luminex.pl/upload/file/kuluxivapililigunu.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/tefupuxetinaxenojew.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/3a3c2caf6ae20bb7ae19f1c6a5291b0e/vodijokozunekireluxuju.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/23f3c74babfe1bfe6a2eac6f49bc31c4/17080352468.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b8e462c7---95917652669.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612592f5a4349---11485956183.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/mifimukopedow.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77efe6997e---51461022474.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97e882969---zakisam.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/28775165706.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/36653034941.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2f9c76e7---77261634235.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16266253691644940943.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/50716016800.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/limotonunuwufojugazapepo.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/78385241764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chemistry+connections+to+our+changing+world+pdf+freePDF link annotation
    • https://mediaget.com/userfiles/files/vetasajodapo.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_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 18300 bytes
SHA-256: 0e104794c38f5f9437eaa197d6ad26f7e8ae5e81f3ed995f431ae8431528b8c6
font_01_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 11400 bytes
SHA-256: 8bef0a1bfbee9307ab5ddab192a0150edf9f3a39522322fbf050f0910424d117
font_02_sfnt_off00014f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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