Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d73302f750a39c2…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 04:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 080c92b8c936f8318796025412c27b6c SHA-1: 171fcac232664558de4d5985c3a0b26e54b2aa32 SHA-256: 8d73302f750a39c224445dd15143232c3b7aab766c69d8f721037cc4f46da9c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for downloading further payloads or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yachtandgulet.com/userfiles/file/kisekuvugomagula.pdf In PDF document text
    • https://cordovajewelry.com/images/file/65543264958.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/51913673932.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dc127df1b3e6ff090a4feceb5b74161f/17444991032.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/biwizorixezuxidode.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zunizabipunadosuru.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivatujuxuwenefebosiwovo.pdfIn PDF document text
    • http://elitk.ru/_files/wuxogeluzajojokoterowek.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ml6e0up80hg4h6m1uoufnpue0k/41321073944.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/21053546110.pdfIn PDF document text
    • https://dyaa.club/uploads/file/vuzalilejirapatejekotiv.pdfIn PDF document text
    • https://invest.pl/userfiles/file/duduzinijedegetipokewusax.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/33459974018.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109270644008221.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/susapidorosewifeninuvaz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ac8f0067---fatiwofele.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/81943957405.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/78161224549.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/gowowijiz.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/maxefomekapini.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210921020705.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/81969506296.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/66670703410.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/wamupoxomefirumoriwowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cricket+19+game+apk+downloadPDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 11120 bytes
SHA-256: b3e82b7949380016ea2d829324148788a1a33319c61c41e3260adf57aca7e87d
font_02_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 15956 bytes
SHA-256: 6ddfc3ebac18c3bbe9a9782f3e8e44ab3e77486e2f0010a76f5f7b46fddfc1f7

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