Malicious PDF — malware analysis report

Static analysis result for SHA-256 36eaddf520abcac8…

MALICIOUS

PDF

92.9 KB Created: 2021-06-29 15:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46dc3137a1bdc952a742c1a28df06e07 SHA-1: bab6edb00bafdd37551c68e881f67d655af3b687 SHA-256: 36eaddf520abcac8d748563fe0be5f8b5c6a66a8205e7862295db73341d86e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/79b8cceabb77de924d40af68f039f341/50867353496.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/66553245342.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k086lhii06keg5ckcvqru9671r/75277420336.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lebelakopakufurigare.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/58507734889.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc95dbb1c---vawudagirevedep.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/me74gu6d30q56rk9na85t6tl57/45500007640.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d919376f15---demupedupuvorupoloxodal.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/asvj1a2884bb905v2fth3jsa84/63667587179.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099c87cb3b1b---8321756763.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/81753457454.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac489f3570---63593456836.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7tfua396rlped8kbu1ebn2fcol/76378290922.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea6e75a41---10357826122.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/63585324093.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fhinnjvv40frcpj3jkphm234mv/rekasegofurenoxo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/87664280918.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/40449991032.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29a9c187f---8928301786.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c19acac544---41594134285.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a5d7786b321d17c0ab73dc62d2569f84/75765977565.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896fe71385c---26025546311.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/54984271136.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f713f48378---96344183550.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b7546b3d---82279746572.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/mujubegege.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/galojixumopepisar.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7b67075f---pufunukorewolebize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=two+parallel+lines+cut+by+a+transversalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 17984 bytes
SHA-256: edd8ad7a7cec1aab02a0a1c233363092f010d71680e3043e820e5b31df668233
font_01_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 10836 bytes
SHA-256: e81bfc74f099da4da77f9ac992cd3b9a3cb1e979c4c0f4bb2ef9395970692537
font_03_sfnt_off00014f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F74 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29

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