Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f0d0e3855be60b…

MALICIOUS

PDF

102.4 KB Created: 2021-09-04 00:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 285d196564142d423cc76db93b64210b SHA-1: 7feac8fe58e1ff3506e61f9ee7ad68641a21e677 SHA-256: a7f0d0e3855be60be25cf4769c559cd1143aec11cecd09426e73d0bf39a7e74f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tktravel.shop/FileData/ckfinder/files/20210615_5BFC9227C5886170.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58878431---78239135492.pdfIn PDF document text
    • https://digicpictures.com/downloads/naropolebofakituwega.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/83de3d65c871aaa0e0270b85c3a226a6/sajef.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/2c22bb82fde178f1e9bc606696df258f/lilekuwelirumom.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/39298511419.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0048cade75---41047715569.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/vigadebajub.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/mikaf.pdfIn PDF document text
    • http://www.pvvc.cz/files/41954704201.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c0567c0---1172648054.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa1706bd32---57670372892.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0569fdb2ff9e767b08c0da4acf86d5fb/6041228078.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bae2c574873---80313321171.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0a4c115161e0f57644a41983f602ef26/gezopefanezimemuvexubok.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/kurobob.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/66979465356.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/pagedenebudizivapabijuk.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/34419928860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=xerostomia+definicion+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/46be89a6c7c3c2fd042fd4a29ff8cd45/pofubenibusutudapipufukuw.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_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 20368 bytes
SHA-256: 865406400b505653e2ea71dde0d7e150e769ffa24c5b6595fdde558664a57175
font_01_sfnt_off00015b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B74 10744 bytes
SHA-256: 952a2a0f346a0870ca4a22c378cee8cddbf3f89478412ea13ae5f835fe1c2738
font_02_sfnt_off00017430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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