Malicious PDF — malware analysis report

Static analysis result for SHA-256 9195d9cd8dbb0ada…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 12:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdd5dd9ad61b68f8b172da8f7a455eef SHA-1: 0070b9a8e53ea13386c186a9763a412da043ed4e SHA-256: 9195d9cd8dbb0ada2a90c91526ddffb756339338bec6d7956285f23c595993fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external URIs and the nature of the compromised CMS uploads suggest a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://seedomoretravel.com/files/files/wajuzovelizu.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cbcb180b---91653877264.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/680790656063f32f88abb10f7c9f43df/wabakawafitepumiwew.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/sodevalakawetakolu.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/fizorul.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/xopafozugopefagatak.pdfIn PDF document text
    • http://metall-press.ru/files/jubotasilexidumapaf.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/wokagidaweta.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/futefe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161450aabf2ce8---53477127500.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/sexov.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/35354040679.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/87479328577.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/57892782544.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/muwawetaratawisudexonaki.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/peketojiwetozelixawagen.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdff516785---52273817451.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/woduromalujiwimujifupo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/981463c5de23902c76f7a3fe1cdc6a97/55776876868.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f4debdd74ff6f2f77166302b294d4eff/60289771887.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/pariso.pdfIn PDF document text
    • http://imi.vc/upload/files/42411480724.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/16301294758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+apps+for+free+music+on+androidPDF 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_off0000bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 16020 bytes
SHA-256: b7ef4b5abe7d877f81e09eb34b17258247e3d7d68253a641311b410afc37d76d
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 10888 bytes
SHA-256: c1f1d157fbce3a4d3a30425eff5ed3e42a7000a98c7e7d7ffdac1f1eb349f925