Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b7907e0e39f5c6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 09:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1771e4a728e02c5e19359c8c88707db3 SHA-1: 9424da10025defdbdd3b66828d0daab24010fcc2 SHA-256: c4b7907e0e39f5c6d2bf9eba91e891b3467ba59f4d781a17b585e6ab6f9c73b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=love+you+more+than+this PDF link annotation
    • https://jamisonfurnace.ca/userfiles/files/xixuzeb.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/dutomemubuf.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/dilow.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/feworunopezefaj.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/15922301626.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/88769451156.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/wolalani.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6777b38f---bifanojisolumeteb.pdfIn PDF document text
    • http://epmachine.ru/d/files/75398300761.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8051d3a033ea7a8ea296f8f42fa3ce8c/44558211087.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bedb6a07a6cb621aaf31a1dd5b532a07/ruzerofifumutuzepo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1629439196.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zaruvufogutotadigusegor.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ift1tss5vg73nl42bgf26pvaon/zekiritesiwonavos.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1d5dec6b0b12f6d219c7d65ec00f65c0/zagekuzedaregas.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mlve34t57c3ca38pqqi9g0pnn3/bebulatanavofewoxafoxa.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/veveza.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/xuwaguz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/46868472732.pdfIn PDF document text
    • http://whatdwellswithin.com/file/69013907467.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad84231084---77392263231.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/73331748031.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/18139735345.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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 18200 bytes
SHA-256: 0ec6b65d212a68d4b4deefe71dce3b4df251e882a882df1bfce5e1b0bfe42fc7
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 10564 bytes
SHA-256: 754bfa47af0e546a19bf8d36117d542660c211e3b7d54886f309a41f6d8d675e
font_02_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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