Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6676d1066db1c4e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-14 05:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7d9e874b7a82b6158d4949d2283b6b1 SHA-1: d31fdbcd68ae02b44628df0474de4a768762b480 SHA-256: a6676d1066db1c4ea7880daf990498ebd1912a89680f81a6dce8e6c63865ba20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jualumnitoronto.com/editor/uploadfiles/8063032943.pdf In PDF document text
    • http://dekogard.net/deko/veri/_files/wilogozok.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/11/21980343990.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/febopuvexelalijivopulik.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/54556260896.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/mepixilufomido.pdfIn PDF document text
    • http://jar-ted.pl/file/94175820828.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/xozemiroros.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc57f0640a---69497055442.pdfIn PDF document text
    • http://apismorava.eu/docs/leradoje.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aa79e4e9a1714e65e727479bbc587e31/80388444535.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109032220408923.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352fd165bdd---3877171776.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613615cde90ec---75015800216.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/46437683462.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pobox.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/pifaloremov.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2f7b8bee---ziponimajotuzovoga.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/67690257420.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/zebofizodipebodi.pdfIn PDF document text
    • http://446888.top/userfiles/file/59722476670.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/58294758813.pdfIn PDF document text
    • http://ore-processing.ru/d/files/4427962559.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/dagosofawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=black+ops+zombies+download+pcPDF 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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 10908 bytes
SHA-256: 0ade5051f04dfad5121950003a1d427f25693db804d7da19536a7d8ca0d8ede7
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16280 bytes
SHA-256: 6c058e5b5ae35e12e34a420f19cb5116701ae432afb983f9e7e5089e8cf790ad