Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c11cf6a1b6acb11…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51cb1b727b35e50052d7edf8cbbbba5f SHA-1: c111b3fe0536cdea7465084fc59fcc482dad478a SHA-256: 8c11cf6a1b6acb11de5dfd27bf1124fd52fe122d2dfe851c7854f92e5c502866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=trans+game+hacker+apk PDF link annotation
    • http://isisthailand.org/file_media/file_image/file/rejilofasupinuwubikod.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/4040648775.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xozavolud.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd34caece6---23498490618.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/54408583742.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/lisusowoferurebosirarisu.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mujeleduralejepidaxugip.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/berukazapu.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/nidelewenugemi.pdfIn PDF document text
    • http://ebus.cn/up_file/file/lapagakurigaveriz.pdfIn PDF document text
    • http://xycrusher.com/d/files/jisabugibiwijame.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/bigivibikofo.pdfIn PDF document text
    • https://titishop.co/upload/files/73879960317.pdfIn PDF document text
    • http://acril.ru/ufiles/files/72834047313.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///48464136965.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613562b899a61---kijavut.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/xebod.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091419250470554.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/dosimereradixosimaxigibu.pdfIn PDF document text
    • http://ijfbn.com/editor_up/laxovenid.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2b5c79f4---bixagewinifuwiz.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/medupitawitozaronozo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/75c4e4d14bde890479ac59caa4130fcb/87273509102.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_51B7F7FAE1D8CF55.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_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 20484 bytes
SHA-256: 9553c0768cd712f86a123c132047ad3c3bfe00ffc20a3463901846b47181e6b9
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10520 bytes
SHA-256: 368eff7dcdb11933092700e702f3cad64ddd18b6ce1b4df6d05bbc36c703b0b1

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