Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbc8c0bed98219c…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 11:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aef0bc77bc358534340ab8a1e8d9ed96 SHA-1: 5dccbac1d809c1e92bec5f32ad32e8ff17ce86fc SHA-256: 0fbc8c0bed98219c832c63467b27ec307d2c2aac9394bba4ccbd19e97dae1dec
156 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing or malware distribution sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f3c9e620---19117666073.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a46d53738---lijuzewazobagojelomirim.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085206466f80---21001741196.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/761fad06de2ac4881b7c95b72b9e67df/delenul.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba67b87a5---duvoze.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/36298657916.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/visupupekinitu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8571cb738d10dd882edd3395b60c9e49/38169987584.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4udrq41kegrj6cqeiitb4s6dcs/77035039903.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ec21b5c7a7c122e7b3eb3da7df896da/5296673002.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/totamadomizamixamez.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/43912079058.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/88298116590.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a740a71a---4850832430.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-5/20210705015030789164.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/9163456468.pdfIn PDF document text
    • http://fteq.ru/files/file/68070226483.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/soxixuwulate.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/46007c34e5e09a1264d42495edeba4ab/papetowotomekotukut.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/49331689096.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/xepevot.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e02ee302b---moluxixutile.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/jaziwakijupuxaxofi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/192e9e5192d518de0d8280e83b729cef/56690513166.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/kixazarifujuziwekufojisoj.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/72182005930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=1.+what+is+the+message+of+the+poem+dreams+deferredPDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 16184 bytes
SHA-256: 375ce06cb111e92128d10f6b9c4f4f5038e182f8f7e1da60984eb8bc7ce978eb
font_01_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10904 bytes
SHA-256: 1f61aeaa6ffb48137c6bba8346b997a613c221f917e1f00c220ccc31bd24d49b