Malicious PDF — malware analysis report

Static analysis result for SHA-256 b426989c8ab201d1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 08:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cecc44a7517bd5f3bfdac90a7f24d29 SHA-1: 77b0fdc8ed15e85ef9a598d1990097621795e54e SHA-256: b426989c8ab201d136bacb29e4a56b9f88d946ff64e830bbb78893b7f1fe04f9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The document body contained only binary data, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zogaxutox.pdf In PDF document text
    • http://whatdwellswithin.com/file/wiwedupumilebizawivewut.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec203bb23---97534477809.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb834aca3---gukepipatirizojodu.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/runofetu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gesenibujotekopidujosef.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631073714.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/28497092842.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/73636266518.pdfIn PDF document text
    • https://kawanmto.net/contents/files/novunisenolupodarudozopi.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/dazabominolegesumexowo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0da9c557---39504537988.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e812f16b1---mesupebifa.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/45251401724.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/wopufofugit.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109121148244900.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/67360118716.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/er2bsl6cd81vae5cb5atjvfsi5/biden.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/dakagigewadameradeder.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/52588386868.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/40144595545.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/zubusowipedevidunemap.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1fbd285ac9df72e16fc2d50ad3c06d9/libuvawewusotupuwekorigov.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vozunupategez.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/29382100795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=is+composite+numberPDF 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_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 18040 bytes
SHA-256: 62dc7192ec9d471884ba983701966dc0c959b117f82733dd9af7d23bdf3c0179
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 10516 bytes
SHA-256: 34703ace8288631fb78be26870f3b4630de5176bb0f1397dfc52d4c0826b9d07

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