Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9ce1b44e37489d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 12:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aae7b4daadc467365b84ac49c0a353d0 SHA-1: 50fd82a8a6ec9c45daf5407b14c14e3f44313c61 SHA-256: 4b9ce1b44e37489d138eb1d734607297e5d1920bf2ecdc6e6ff30f5c0e089d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised WordPress sites or disposable domains. The embedded URLs and the nature of the link farm suggest the document is designed to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=blessing+and+honour+chords PDF link annotation
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1e71b2dc4c0c569da26329b223f18d4e/bowowovakubobonotuz.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/21946114973.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/dekoxebekemivubuke.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/56810892905.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/26491151318.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/56169467995.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nopitenafuwusewotirajepaz.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_056FFE30C21ED46E.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bidasagopek.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/rokadozizulumimubi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nadvre4cgfl2ilvg3770f721ka/mukosetixetumin.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/14634752019.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/72125092671.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/borudazozinasafifanoku.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210904100701_e8hljb.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zudotur.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb613b18---47427229124.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/79879754671.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mojulozaxaxuxavuketo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ac20c775753124a3cc44371af88f07fe/98592721053.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/37006156400.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/95142127931.pdfIn PDF document text
    • http://gibisch.com/files/files/41072329587.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/51139328680.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/jevimesajokomokibej.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cdd6027dbfd38cfe838d307d525829eb/xefonazogebujuvumog.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_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 10704 bytes
SHA-256: 9e139c8fa6679719cc3f83b477e4a86d255213e8d788129b52527c890f3e15ee
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 17240 bytes
SHA-256: 2b22a809faff7685ef300e08276c6ee74ff81634bde5b5de3c44aa33932899d2

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