Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7550d2e5e106f4…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 02:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48806c0e98b8d5aaa3b4ef7235ff4bda SHA-1: 79126cf8719cfd369f77c16458a5c1859ba4f4ce SHA-256: cd7550d2e5e106f46158ac5a7637a592b6b0f927be8891f8f0cd686bae361328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may attempt to exploit PDF vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=is+a+cell+wall+prokaryotic+or+eukaryotic PDF link annotation
    • http://getsolarny.com/userfiles/file/12570982146.pdfIn PDF document text
    • http://jsdarvin.com/files/bidajejijuwawe.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/wejabip.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/862f2fdac2db4d1d817568fbed08768c/84293919307.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/98bbc44d4b4f3da1bbdcce55800e29ad/diwiwojubijosexa.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/14810274388.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/67192445307.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sober.pdfIn PDF document text
    • https://terracell.info/images/file/54845029789.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942801cfa4---xukomizonixupefopomovumel.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/32322908248.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/kinodonuxa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3f6235ed637e42a38ac6f674820290e0/jilazasewapumawake.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/16137666262.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/wutewosukerulukoxix.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0ec5d0c0---22777262517.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_221105.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/80000997580.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/87113916428.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/mabenadipej.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/1770558785.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/97789998732.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/zasuwamuv.pdfIn PDF document text
    • http://mylodge-naoshima.com/vabulebakibibugiz.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/16108676823.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kofiwopij.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74f84c0c444055f1d3288982b6d2cbd/wutimobi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/33969759219.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_off0000b84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84F 16776 bytes
SHA-256: 128786e43504a529378018569f8cf1b4aaee3148f4ef971901f6f7663f069f97
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10604 bytes
SHA-256: 247d0b605aae0de3fc0ee4c5e4d63c8bb9946e8b45881b57973bea82cd4b4efc
font_02_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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