Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07d34960305679a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 15:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 342ea0745306eec8b19e688463aafe73 SHA-1: 1e800e0796c608d3347c22c1c942debbdd2dcae4 SHA-256: f07d34960305679a81fffede90caa096b44a00849c9f9d0558cdd338b853e377
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host or redirect to malicious content. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=x+men+apocalypse+english+subtitle+download PDF link annotation
    • http://driver-jazda.pl/upload/file/96028810848.pdfIn PDF document text
    • http://kahasat.cz/data/file/18458209105.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/rotazivetana.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/52716024318.pdfIn PDF document text
    • https://nevisnews.com/userfiles/7399333818.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/82356204970.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/65718400497.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/70589059809.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/38c9990472437eefc2a3de1eab5b7ec5/40903220841.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139886d0f22a---getejegefasuvazutuwebatut.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b48acb3c---65866184226.pdfIn PDF document text
    • http://crm333.com/documentos/file/89098065603.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a02d1bfc764f6e9721c5baea9eb43bd7/73959490841.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/sesevebe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57f2af4ce---majejuxi.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/pefekuwezepaj.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xagujuzarunad.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/91614031782.pdfIn PDF document text
    • https://vleek.com/uploads/files/nodubakawa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7eb5b445---xobotobosizelo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/40266867772.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6122458134.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/56434591546.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/91924322634.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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 17256 bytes
SHA-256: 71bf28483b33fb2f53dea5e3d6f1bcfc58a36a738b7f20c886e43d1fba4662bb
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 11308 bytes
SHA-256: d8858c62f949b60f48941df3329d6fa52289c9cb11696815d31e6c42a5dddc33
font_02_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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