Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b58359b2d2b959…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 10:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 016b3bd12fd2ce902eb32c3142223214 SHA-1: 6d4fb504b3f0694e55bcf28aeaca1362842d7b95 SHA-256: c1b58359b2d2b959858d025598928f01d34f3111eb84613293175a3ad161f7b2
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The presence of these links suggests an attempt to lure users to potentially harmful websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607536158e164---9741705504.pdf In PDF document text
    • https://odontologosmalca.com/images/userfiles/file/53552230855.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/73703973658.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021811228336397.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba076c9be---24413365965.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/22295192334.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kebaxifewopes.pdfIn PDF document text
    • https://ultralloy.net/upload/files/84348166643.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/nudifidejekukipu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79efeb153f---56897818422.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zetijojadujupevuso.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/nimonesenija.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/25389821803.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ab9fde46617d309465410404b00e8f0d/3575396884.pdfIn PDF document text
    • http://yulintimber.cn/d/files/85281981521.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/02f58bsd3en4p10dvd28q3fl3t/pelipurudegofikefedogu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611391acedeb2---42159602643.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/38856948293.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/nomaregogejodakijufavo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f594b5f3a---gevoxirumaberem.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/4777478164.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b18f1b9c6---46140886097.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/76997335096.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ef13fdcd27f9171f40018f05176606b7/jodukubomogekivorat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=14+de+febrero+historia+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5b0fb786dca852df4ff124610b0ad8c7/48013354008.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_off0000b48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 10620 bytes
SHA-256: 1fc2dae24fb7f801a00c1c87ca231a742ee5e00bf5ec368bc7fe1ed1752603fd
font_01_sfnt_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 14596 bytes
SHA-256: 7861c398f1e466ab54f838dbf179ec5cf92b5fd336fcfe19d05752fa698b7dfb
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1