Malicious PDF — malware analysis report

Static analysis result for SHA-256 b434ab8394ea9d21…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 15:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6277744f7d4d7a94fa7a9d2bf4351cd1 SHA-1: 10d31eee249eaa2e4f7b9ecf3f80fe31818f7025 SHA-256: b434ab8394ea9d21fa542d490e3f694ccbfd53dfdaf94078d31f5e3cddba3bf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fructusartis.com/i/File/perukapeze.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081d90b126---wamesedivaduderixake.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/mirilipotagozifi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/3658169304.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/fazupazenudugegak.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/loxona.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612177fe502aa---mewunimaja.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/15530632399.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133582991bb2---bebij.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gasetalurudi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3d158f6692d800504dd6dafbbbcc0340/97483429205.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/81576225751.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0fcfu8hs11jeaur4r6glpptbb/61328570252.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wizasagibi.pdfIn PDF document text
    • https://5udua.com/contents//files/85298193641.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/solgpdmgu7u1cfptmsith9336f/43966721753.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sosak.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/ledovifuzavijaxejibaboj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/90414ff9f42d36d15290de7c609fb76a/9477819395.pdfIn PDF document text
    • http://stasta.com/userfiles/file/lulapigaf.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/91313156853.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/64435985694.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/vubolerigabubokizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=introductory+statistics+10th+edition+pdf+weissPDF 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_off0000cf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 17784 bytes
SHA-256: 2863f6e27fea15116c9d7ca744e4afc3e871c9f3729c896f2a626ab5f00973a9
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 11096 bytes
SHA-256: fbb6afc9753aab8797ebf221aee5976f5df6c46dc725e6e2474c8b819eebac2e