Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcf0235ed421a5…

MALICIOUS

PDF

109.1 KB Created: 2021-06-28 17:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eeaa467e4ac8ffb8d3ae9a9dcaef8892 SHA-1: 8822d56a613807def218315260bf6a03a6e21628 SHA-256: a4dcf0235ed421a57f66b7195f58f2273b9c4be16111d81456b219baf789aab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=witcher+3+inventory+editor PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hqnj0reb2binluo8dokp0386g0/96427617890.pdfIn PDF document text
    • http://inse.us/uploads/images//files/jojupamolibekulowedesomun.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vewojukinolupelupepup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c265a5af1b73cbadc784f53da6971aca/70824469531.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sukogovipedakoda.pdfIn PDF document text
    • https://isosklo.cz/uploads/78338560267.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/zedirukesowoxozapokokevop.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc8e0be928bbbdb3019098035521debb/25346567949.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02c51dc92---mokefepuku.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4827ad6d68---29393953704.pdfIn PDF document text
    • https://banghenails.com/upload/file/warerewove.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce8890734---kevivu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c415b3504ec---51263573049.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767f679a651---82734939801.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///96875917420.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b753ad688---99643842802.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210610/1216326086.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/muvususawutaz.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jsmrn8jbesl130bv3uejuhjmjs/gopifo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/365b8f451c03204e930b691d0cbc46b9/sulixozuti.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/67925724840.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10901b6b08---98884403459.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14952 10436 bytes
SHA-256: df388d838f5f97ce639cdf82e98a4ef226a2b1fed430bf0f76438b1909b1fd3e
font_01_sfnt_off00016104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16104 17652 bytes
SHA-256: 7bb768b41874364ef19a46a63b0b1fcfb907f1b4d4a53983f4184fc172c57d91
font_02_sfnt_off00018f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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