Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bf781d78d98b9b…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 23:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1feea667fce8d290c6d8bffefc3ca29d SHA-1: a79de7b7421e71f201e00f84441cd051987ff241 SHA-256: 96bf781d78d98b9b4e0fb8fca80db77ff5a6722cd943de614298377eb51b1b33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://viettrungson.com/media/Files/verosibatajogovur.pdf In PDF document text
    • https://cancelaria.pl/galeria/file/xefadumalulazebazi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca2121fbe3---tobiwutifitipezudiv.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/31d8a7a0617ae44777b3f7d46eddaf3d/kidazux.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/13097957034.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/zewuwiwapokeje.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/23984646153.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fd5a2a1a5ab8098fabe8138aca4d9b3a/44940751856.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/nikoxate.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/54457163491.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/96325004901.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pusibi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/14354526236.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/91340295479.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888802b09b---suxuxumebigisan.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/91347877711.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143c20729d48---goton.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/72568114438.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/wanepupof.pdfIn PDF document text
    • https://777mto.net/contents/files/73330358886.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/38897079895.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/bukinodoxo.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/57197071411.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615008f3a7d7b---fuwagevegobejomukasar.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/59744830839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=major+subject+meaningPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 14788 bytes
SHA-256: dde214125a11ab068ef02841534105810f6f19b132e142dde3bffb9ee590f898
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10888 bytes
SHA-256: 0dc71c8386a6f846b4db8695b229716372b49a9a8f76c8935aa57707c8817069