Malicious PDF — malware analysis report

Static analysis result for SHA-256 30106bfa91d85ffb…

MALICIOUS

PDF

83.6 KB Created: 2021-06-13 13:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b25a84fe4066b6ed344a838f341422aa SHA-1: 65e9eefef8f4759675f38a294092b83337fd159a SHA-256: 30106bfa91d85ffb390a4a45e80bd4ef3464e92e868b9f89f977586960a9b98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to movie search terms, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=salo+120+days+of+sodom+full+movie+online PDF link annotation
    • http://agcslohian.com/userfiles/file/66851182597.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4a983bef---kewibafu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/dumomufofalapukajum.pdfIn PDF document text
    • http://bronia.org/userfiles/file/tamubesego.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1f39f76e7709fe6112f9bca2ca29803/lumidir.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/muvujomowavono.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/35545771766.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xufasoxoro.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210522141651.pdfIn PDF document text
    • http://skomi.ru/img/files/file/12329742505.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5fcbedbb81aedf3ddf1b35d88b894f5c/soduseli.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2dac56cf9---padabupigofajisuzav.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b7704969b70---sadabaduwerovuviliki.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18a666f2---sukase.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c22ca44196b83dc4a16750ec89760a13/molovebudu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a88d8c68---mivejoxuveraw.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/veprdmercann318l94vsebubfo/patevirugopuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 5348 bytes
SHA-256: 7389306288f20747dabeaeda207af13f18945638a1217ec103d28f1c593b01d8
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 10836 bytes
SHA-256: 18eb91a4aabddf9b3e53ff1c16932dc88b7e8f193c6629d277dd867f9ac78268
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361