Malicious PDF — malware analysis report

Static analysis result for SHA-256 3580a583caa7d26e…

MALICIOUS

PDF

132.4 KB Created: 2021-06-28 21:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 73d6caf124b51d7f12aa2862d1f19475 SHA-1: fef311285d0a1f9cd3af4edbc8332da08cda62bd SHA-256: 3580a583caa7d26e517a0e8c5177bc9863f81ea178dfcc4e9d042bad1ed6e044
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/166eaedb9e16991b5fdbe3c5e263d4f5/zeximikinulo.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/38e55975e5c82f7623221ec08d9bd043/zogulibaw.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/75988558005.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/66903755151.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/u15d62htejdvrftr99quii7sl7/62878700812.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe602f468---mivegepufibupesaxurasito.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210613055814.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210620160818_u5tenl.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8deeb0cd6ba03953b910a71b2cec92e9/55432726578.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/36315791885.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fexejamuwiguxawikali.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4c6e470ca239a02f2945aaa2580695d6/94645605229.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/rigifenu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ae75e6367d5ded39b9883581f5f4d663/mozej.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8970d296659370e085ed11c825e21c0b/89576533834.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/667c0a119ecdd0bb34c6138c55c7c7c0/wijujumosojavexigifuza.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d804715cb3---zuvemutep.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/abf2768ccb6914c75e849548c3c471ab/6689005096.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2607f245d4---62871731685.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2dec50f4daa74c7b9ab98ec76ba2a8d4/rutunedivowo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/23086662092.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7c6586e55791930ca154f10960f267de/42129129896.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/saxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=determine+meaning+in+tagalogPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000180ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EA 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_01_sfnt_off000196d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D2 19684 bytes
SHA-256: c497bfe7b5044f2057ae4fb13b6908682e8922282fbf37828fe8d878a61c7eb8
font_02_sfnt_off0001c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C99B 10284 bytes
SHA-256: f101eb9874091e78c9581fd1b9e8a80036e7b011a0d34dbf4af67843dd4bb0d5
font_03_sfnt_off0001e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8C3 1908 bytes
SHA-256: f1a1d9b47b5eee2fade882070c3332651c81c60b8e604f9a9b670748226e5382

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