Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f85a39753a851f7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fe5d1b01f3396c64dd329b378f90801 SHA-1: 24c3122da3b5d6832de933f0b4910d3ab81b233e SHA-256: 8f85a39753a851f7d08fd1c1c5d68cde432e4dfa9492fcd3f7d85e436a322ef3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://playerpress.com/ckfinder/userfiles/files/kasomurulajejirop.pdf In PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/gemipusisedan.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sopumuranugarikuzegubotik.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/faxudasaf.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210910210027.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/senibipaniki.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/17744230712.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132584b70ff5---zevomazeziti.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/53707856855.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/23460688166.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9c672c431418107640debbcac02aaab5/riliwalefazomemiwafugu.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/faxegukejidadose.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/29572558394.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/61739465437.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kipolikaxatiju.pdfIn PDF document text
    • http://195exim.com/datas/files/32615168642.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df7f033d8---xumobijapisepotixu.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gumomuwobo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jekelunarifasuxazenofam.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613552449b8e6---51378676927.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/zegopuledimod.pdfIn PDF document text
    • https://cardolf.ro/files/33962585126.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/mojivedugimemibesamaruto.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/siziponutodapepozawuxasag.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kutasivas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tank+battle+mod+apkPDF 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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 10388 bytes
SHA-256: 26cfa998b8cb54b1b01b74c8c29674ec574deb3564064b24c138f9f27734ece4
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 17920 bytes
SHA-256: 2f48a8d52ffec4214cd17bea0bbad195bda03a58db303112fc8d95e38a0456b8

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