Malicious PDF — malware analysis report

Static analysis result for SHA-256 2957ee8f5aae6506…

MALICIOUS

PDF

81.6 KB Created: 2021-08-04 23:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b2f79f9dc5330c3a2ff867753deb1a2 SHA-1: be2aadd7129be5d979ce00df8713bcc3d6177ae9 SHA-256: 2957ee8f5aae65062340e39d9c3e519a9f5dcfbd621e2814ae062ab4492346b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external links strongly suggest it is used as a lure, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=nelson+math+textbook+grade+6+answers PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/01cc084475c709bd7562842eeb3b6b21/25366141542.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/78072736043.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/sekajazored.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gawibara.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ccc0b74d3---97963356984.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52fd0e1feb7a550911bff364dbc11e6e/kipapurubujujuvolavesox.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ca8f125a940e4d3265fcabd8ab664f76/mososuliloxagurefonuvowo.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/purojibevamadibi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fbb99ed8ab02e38a267ee4897d9dbfab/57337776359.pdfIn PDF document text
    • http://schokofontaenen.de/idata/popazanavasavomowa.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/sasadaw.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6d984603007e8b302e30422f2cffac3a/75766596228.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/33748334179.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rn83lon8e474lvcaif0nf8135r/tusizixufomekazofamikad.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dlafjqjk3g6n5ikltssoagh5m1/58144943596.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81f78d68d---sowofezifipapevogibija.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206aee05ad---lonoxoviged.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4336b436b---72415819334.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ujc2mb9uck08l372mt3pbpqbhi/80340321686.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3086ab7f---timujuxi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///54614732227.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bigabevokijapimitid.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa1132b11---46753933322.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 16720 bytes
SHA-256: 5d597bdd97494556bb45fd5e35d89d5f779dfc95db775075cf48ea7c2ace5bfd
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 11168 bytes
SHA-256: 2ade2a4ea072a2a456f9514563d836be9f1e0cce4ebe647d869216641cf07fd7

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