Malicious PDF — malware analysis report

Static analysis result for SHA-256 566efca6caf865e4…

MALICIOUS

PDF

83.3 KB Created: 2021-10-04 21:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f3e4ea87739ac02e12e58d2ed35015a SHA-1: 3e90c624586d4faad70939142c1456e7a7b63b61 SHA-256: 566efca6caf865e4a7257b70dd635ea5bbe3a576a2d94a85dfb05a7cbe29e498
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=law+and+order+svu+season+22+episode+1+watch+online+free PDF link annotation
    • http://biondiairsystem.it/userfiles/files/bawaredazanoli.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/75727456011.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-29/20210929115656695653.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/84974611376.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161559f2f9916f---5812740924.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/20d8db127036a5caafe29b492fdb7994/33647088471.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/setozedozazubupe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/21667ef4e02b797c2ceacf336b3aa200/lekirejejiwosop.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/29410835946.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/79187104660.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/49196760555.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/79297032798.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/14561968492.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ea65c05f4d34b3826efef1dc5f08f41b/33695236714.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/56100809061.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/15872756568.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/gixorujalozo.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/boxewutuxaxetum.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090416270827334.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/34365306962.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16158cd3ba2d72---jezajozuviguwojavelawe.pdfIn PDF document text
    • http://theponghop.com/upload/files/balunimemulu.pdfIn PDF document text
    • https://value.ae/userfiles/file/magozizaxegemebusofi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf441b8190---wanosopimuvomupilunijum.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 11100 bytes
SHA-256: bc20fa2006042489a711e1553f2ad3082e7c4bf2b949033bf37e16147b954704
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 19784 bytes
SHA-256: fa8e88a0528b974b3a1fe0d24e6a51209f8ae5203b82f9ea2e22679a0d621e06
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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