Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fdbcc0da1cd660…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 07:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f60763d452b3920120bc3603eccf3887 SHA-1: f8157d14823620c9e126bf9f8bfab69c30e15e7e SHA-256: 44fdbcc0da1cd66057d86ba471c64dfce74ab5645d54d8547b80b500ede7580b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various domains. Heuristics indicate these links are often hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=farm+simulator+19+apk PDF link annotation
    • http://opuspointpartner.com/ckfinder/userfiles/files/32268302893.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210908100921.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/gitudumanodevipuro.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/gakotubir.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/75214426662.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_043124.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/kepumubuzavemikasadamupap.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/80456405117.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/73625392712.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c597e2f0297ced08e46801614309e617/2058585245.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfa8e16ff---51315750822.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/zedatazerebuzofosej.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/79298379363.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/89659584480.pdfIn PDF document text
    • http://elsped.hu/files/file/5731652497.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210913_114527.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/kegesitezazolura.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/555166195.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/mebabelubor.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/mewipeniwomilotuselejas.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/zawiwosatoxabuvugomusiz.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/92945077386.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9907c6ed4---kedoduvaminilite.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xabamefidi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/18820319864.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_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 20060 bytes
SHA-256: fcf7b00251e27900f5a2c440139bb2f09b13ac3d035f83aec878f2510ddb5cab
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 10568 bytes
SHA-256: 30968904921570624f5ccfd867b0cf33e4ecf5e1fe127f4814386401730f488e