Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927bc6bb5f6eefc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 22:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a80b8a756a6729c7a83cd5a3ab9a2ad3 SHA-1: 3b9414bf3e8f33fcf6a9b14593ab36d552e2dcda SHA-256: c927bc6bb5f6eefc185f16bb11f7460d3cb327fafa73c7d60f8b725e09a5e865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=ehome+media+center+apk PDF link annotation
    • https://devcons.org/uploads/userfiles/files/14220780898.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xodafajoxa.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/fifideberexujexe.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/77056084826.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/tafevividus.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/38bdbapjvgq0gnj2trank5g31o/bofawimamunexesewafuz.pdfIn PDF document text
    • http://vkts.se/userfiles/file/pedixopisofejoj.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/31961ab2ef910c5817a004103f4c6a0b/sefatizibaxev.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/volilitafigobor.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/69947644884.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/werozisexufedatuvorexem.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/ruwes.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/35783293033.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/wuxavujefebu.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/sugitimowuru.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138327519992---kojeterajirede.pdfIn PDF document text
    • http://qdjshg.com/files/file/xubodobegozujikul.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/63083837933.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/davaxenog.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/27852396012.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/481dd454582eec4af648e475ef9ab995/10465966152.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/zekejutefu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/93349469124.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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 17688 bytes
SHA-256: 7dccaf1e58226884c08d364debfce72939de5182699dd0776aaa22338c2db99a
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 10640 bytes
SHA-256: 10afaa3e66ff12c0e3495a14569714634aadc83e28554bb7187869cddcc20656