Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c6f7a155a244db…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 10:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49edef7c70b1fd22b1ae0860e8456048 SHA-1: 5032cd74079de08cf564f56ab066f7c1cc6e2790 SHA-256: f0c6f7a155a244dbb1fe57962f9794a5ea3bd33b61ea5013f3399452a6ef261a
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, embedding numerous URLs that point to compromised WordPress sites and raw IP addresses, suggesting an attempt to redirect users to phishing pages or download further malware. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/52327579280.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/tebuwef.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dudizatabokokigebixilu.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/2376010641.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/1802775843.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/55238301775.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/lufomugitapunurorer.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e7f06d313673c7eda8f2114d71e4c7c/xewerafisosimaxolunipo.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/66b4e3cb0945ae7484f9782bfcedc219/76355152214.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6584636a12---68692263780.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/92198001017.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tetizizajogil.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a603d515a---rinuxifuzavusor.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/gufagokatubogajosixus.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0811b32bb---nonezivajifokaxax.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d451891---daxadejipas.pdfPDF link annotation
    • https://nguyenhungstone.com/uploads/image/files/bokitaki.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/93636872866.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210625104558_4m15x3.pdfIn PDF document text
    • http://getvisa.ru/images/File/83947788526.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/80377678396.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/51440290145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=teoria+de+aperturas+ajedrez+pdfPDF 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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 10596 bytes
SHA-256: 9a8aa9e9c9e01be3bb85144e590f541f5688ec077714e7564eedf6640124b059
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 20388 bytes
SHA-256: 20ffe726a9365e01e01123a200102a9ded9b4b2bc68da511db454736dd46031e
font_02_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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