Malicious PDF — malware analysis report

Static analysis result for SHA-256 28863221a7332f67…

MALICIOUS

PDF

78.2 KB Created: 2021-09-25 06:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0256991d3b5a3d116ef5971020c4c1a8 SHA-1: b9f476b380113b5b834dbb12176a86fd8a0b812b SHA-256: 28863221a7332f673d5c8f94f9cc1eb69916bc4c1b0a4f24be96163f8997e72c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to improve search engine rankings or distribute malicious content. The embedded JavaScript, though not fully analyzed, is a common vector for further exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://globalmediaminds.com/uploads/files/nowexisafenobimojos.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/xikavatosakud.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/98827260960.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/dizunanava.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb2359496---wupabo.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13854328169.pdfIn PDF document text
    • http://telecycling.info/files/file/vimagiloritudumozevivul.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51268dc9a---15357643663.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13410298569.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fejinakoraronolonimoren.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/pidugubeju.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/2974288079.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/lutilevemibusifis.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ruguvidajinozujudobuko.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zimitaw.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/36624468051.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/63016274951.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g29f45t5ip9569ik5g3khggll6/86402103191.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/8871658993.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913091653229208.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/72855991635.pdfIn PDF document text
    • http://abnicum.com/files/file/36343628152.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48420118736.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6302284371.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/xojag.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/navife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+rom+for+poco+f1PDF 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_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 10340 bytes
SHA-256: 1a33a76660dd1be82a01d1f5f4ca6cfeb06e64855f94c87eefb725846f3d41fd
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 18640 bytes
SHA-256: da4193ba10502c6ec51effbf967904164fb49091afa22feb98ef9967fc559d36
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1