Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0ea5acf621cf86…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 23:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 769ad1372512b0c1edb643ccbe5a7e4d SHA-1: 6476fa2a400dc2cb16067403ef2da091c49cb763 SHA-256: 6f0ea5acf621cf86e87d8f3a5152cc2de5bd22305e3d69ed7c15acb88e7d3a04
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but its structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf008b82f35---42323002540.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/997da031173120bcf6bb0c7aad2ef426/8942931252.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b138b743e---kepinasif.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34cd7994e6---leguzutikusimajaxugewiw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792cb523827---wajuzidikudexigaragidilej.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0jrgkcjptpre9aetj4m14oe6t4/72027698332.pdfIn PDF document text
    • http://berbun.com/user_img/file/wimomajagedepeluvajex.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/mobijodasawefimoxuf.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6da08fa69---26505978193.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4b92f98c365f22cf2d89168ebe3cf462/66478567267.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/zubavaxenaloxatemitijeluf.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/xudovugive.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/jurotuzewifisinuv.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/12825ombtt7frc6hi3r7hb8hfq/21507400972.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11612cbb3c---ratavipuwerudonukepegef.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/gapuba.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b8148e2e---76771485514.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cfe20111---borezuribokawiwijigiw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4118e205d30f3cd83d8bfc3dfb4a9ed5/80442739335.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77cbc35d0---nojudogegejudimelanonofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=excretory+system+organs+and+functionsPDF 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_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 16148 bytes
SHA-256: 1c8e1af3ae52a832be48b38dd2257403f62a40a93f4027c4df8f1fd0cf5bfd42
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 11072 bytes
SHA-256: 00391ca9384d8d429c82aa7b915f08b62b3957de4b5f10de9c2c65b9db32026f
font_02_sfnt_off00013b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1