Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc8c32694dec2cc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6443d9aa559db23b59fc0d134d99a7ca SHA-1: dd6b7e9000d57633913538623c63c8e1f14ce91d SHA-256: fdc8c32694dec2cc7c835145549bab99aee0f1a8d68f03b7340d53ab195439ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of a link farm suggests an attempt to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tatsolarlight.com/uploads/files/81768641338.pdf In PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/3901484681.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kefizedikimufarijoxoti.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3fa7b4d8e5da3ee45df0e247a6b96603/16941614838.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905160046.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/6739261306.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/19205907836.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nuxajodepizog.pdfIn PDF document text
    • https://cargotavio.ru/files/file/povoxizaxopawuregenoleb.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/vetosu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/84120ac8fcd274bbf1dfb5526c5f5457/93382668545.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/85554285066.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396c11939fd---pidok.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pelomixuvaw.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/xazilada.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/biwifemelid.pdfIn PDF document text
    • http://identik.hu/editor_up/33829763658.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/48028891610.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/rajalidomupikeni.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/50079753776.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091205522780.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fc08d74d7c59f7216bece3a74452189/86531102228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=notification+light+androidPDF 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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 17856 bytes
SHA-256: dffafc087a0ff893e3c6f88b1c522fa43228e6cd612a5bc556970097d60133d7
font_01_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 10432 bytes
SHA-256: 33e788b518ca989f62f9eecaa47c3e99c5946d1ee3b23b7e4e15df3a6f847d95