Malicious PDF — malware analysis report

Static analysis result for SHA-256 4753e0baba9be2f9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 00:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19faefcfb6f9fec290db8dff73c3817b SHA-1: 57dabdd8192a54302af278345033fd1bbc25b780 SHA-256: 4753e0baba9be2f9e1d7703efbeee1ca1c4bcd6cd1066e4a2575b33f07a449c8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised hosting suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://healthmatters.me/userfiles/file/42183196566.pdf In PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/wigazufogezomagag.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/gidirevasilixusaw.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/37209202207.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vapuwuzunanabezakalaku.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/9e511a4a699bf5cdfd16bcc772f58f89/bitumurifiwaxi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/39d7ntqodoro1a5ffb192kc910/fimitubebenozi.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210705/03084269.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/22312cdd69d2f1b087888ca77b6cba9f/ragisuzut.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/24872514083.pdfIn PDF document text
    • http://drironcat.com/images/file/zomitedubafesitome.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2e46963bf08a5f094ffdb3ec98ac9104/67590470773.pdfIn PDF document text
    • http://come2menorca.com/images/file/visuluven.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741ffbc0558---74695823770.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc9f834da---22323868695.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/debixotekatibadamu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nesifojelutonov.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56abb5a8ec---binolokiforufokofekow.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/nunaligaxomi.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/32816128387.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8ae071bdd7e7afaf6c204932f87a9394/49632588577.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/gpc0rll5b2sd33661ehbvkjeho/genimotipot.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e335e9bd---fememifoxixakafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=case+study+on+rainwater+harvesting+in+rajasthanPDF 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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16608 bytes
SHA-256: d5866fde215d3d7de06fc6e72ddfe9b24ad6e130e2f5a74722c2d32162c70797
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 11008 bytes
SHA-256: ac974e7056e069cdd0844866f0d39e0a237c56eb2ad0cdee0b97153bf800bc52
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1