Malicious PDF — malware analysis report

Static analysis result for SHA-256 551425d972fd531f…

MALICIOUS

PDF

93.0 KB Created: 2021-07-22 03:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 42b74deacc43f6d69bc08402be75cac9 SHA-1: ccda426aa38468937b806805933aa0adef88b0a0 SHA-256: 551425d972fd531f76d8df44123926e7538f79c67293c55b5b1a5941a9503a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://goodtraefarm.com/ckupload/files/wegojuv.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b89479be---xuvuxozowekujitadibi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8a537680---63339796106.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/18744328830.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4ab70260---daluladitunozovumilo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e129ef08521---fogigoguluvasotokonal.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cc2ad4a1b57a14d0ae80f77e4cffefd/86130823051.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efff11b13b7---posugu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/37811476253.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/xopotinoxipivazikilaji.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ef73378e695f033dc8cbd1e2164dd13c/zubopa.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/8763623737.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kbm133idv894a15abu3qgej12d/xifikop.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7b6a4cc4---masafasufoxasedodururipu.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/lutogafekigigovalufog.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5cbf34464---68266487303.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/65b2d6bb17db05b55ab1275c96a6fb4d/tebolozagijafofanojeb.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/67675278312.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/levazagiwubidowejije.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/71035066961.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e55c6b51d31---rekemekozuzukesexipaba.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943fb3fe3c---jezebawotubena.pdfIn PDF document text
    • https://service-panev.com/userfiles/jawivurodudujefilaruja.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/53326920675.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/jagegejobarate.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871e38508b4---fazofifumezomepidak.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gawavutod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=winit+code+todayPDF 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_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10156 bytes
SHA-256: 8962b88cfea4fe1d5941aeb83cc6a86779a0ede2368f58effdd6fe5dc8306e4a
font_01_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 18152 bytes
SHA-256: fad74b099d4f03c675af68629f5ee8be250673ea5a8a077c66202a3e11ae13f1
font_02_sfnt_off00014daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1