Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e9f2f6cfaccacc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 19:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f5fb26fe120f0e8297a7c829a305e02 SHA-1: a9d964fe127a2402eb22bf16b20ac34d0798ceda SHA-256: d8e9f2f6cfaccacc6eef2a38efb72f6e39da8f8e73cddbe43c8b7ed9ec6829e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=find+the+length+of+the+curve PDF link annotation
    • http://legalinet.eu/userfiles/files/rugadalulefipig.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47959067572.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/kokeramebuwikube.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kerivakijirakike.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81002793029.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/pogorusumokujodezinebiv.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mesivimurebasiwepafi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f87bfbae---63826206342.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/newulakelejikupezodenixip.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/60359034469.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/62950468060.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/36513786488.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/84186967839.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/88894127213.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kobixekakedejesuju.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5eaef3e0---52947024182.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/12275649570.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/45132437510.pdfIn PDF document text
    • http://stefani.cz/fck/file/tobogonirajisotezal.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gezewoge.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109081628545632.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/27253389252.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tajifafe.pdfIn PDF document text
    • http://skia22.ru/pic/file/rarulix.pdfIn PDF document text
    • https://cian.hr/userfiles/file/52753330100.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143091c00c28---xapepijo.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_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 16368 bytes
SHA-256: cadae7a2e807e2f84af4aba7e2155ddd2f48c4066dcd861778f6672600554ade
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10568 bytes
SHA-256: 4b6642fe3d74d522255cc8d7bf770b24204a8bd0108c3c03b251647c19213ba7
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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