Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb5c2684ed4bf4a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 04:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bb9bbb44d46ff611c1c2e24e0e8ea7e SHA-1: 7c0ac861caaa888d1bb3df3a3374f6b3b92c1d39 SHA-256: efb5c2684ed4bf4acd09293b17f60a121be80c66f1e097a4f5a692a325f9dfd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through social engineering or by directing them to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://texigo.tw/upfile/files/2021/08/19/satepunobidejatanafew.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a52f5b45b---tijawevudikefigixa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/70801121242.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607425d4c539f---lejobozotitezinigodo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8074c1ac12505715a74c012e1c4d20de/8024477310.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/jejivekuxorane.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vesekimojeru.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a178e1ec6a---xunojadu.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/velam.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/6930349071.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/19948911809.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507104617391620.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca254cef5---98227920370.pdfIn PDF document text
    • https://jurad.eu/files/file/36980542320.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/beluporeresa.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l2npc1qu4bgvf6d4qic7at9jfb/73975464130.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/wupetirunoxisok.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16272400301223461448.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/67240669489.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vugukijegumuvoxex.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/tegewofa.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/liforikimele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cadence+single+cafeteira+manualPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 18540 bytes
SHA-256: 0e8374a0d9ce2430ef785bf62b2809b30331282cee9d845fcba0037955653382
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 10828 bytes
SHA-256: 66cd48de4e2444d55d3b3f23d4a471a639251f9340715f6034e027dfa87f6d73
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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