Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f67943f06e1bd7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 21:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3766e129455eb29ac93a52f47806c4a5 SHA-1: 03e221984fa47f4cd67de49bd4cd93b5e238afb7 SHA-256: 20f67943f06e1bd71757c831e2045102ae42a3feb33c195e1e02b67fc02ca63b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.clc-engineering.com/siteuploads/editorimg/file/dofevot.pdf In PDF document text
    • http://ipceurope.eu/assets/file/teketazezote.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/60137638641.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bifemikixu.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/84530348782.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kifufiwozisig.pdfIn PDF document text
    • http://sivam.pl/files/file/sevujizusufopoxotavawu.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/toxugojonenixi.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109110154123581.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904020324300.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5k66kipvog3j5j3j5127toll8n/41013947155.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dijunutozowe.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/dabexopebuzukexa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f34e6cfe021e7d11fcdec7ae451c4d1e/88365878830.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139efdf0c621---malesiboxavo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136878229fd8---24081152366.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921547507715.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/24690668464.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9e9be38e---linanu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1ae1hg645ml64tr53l4pe1dru3/bibiruxagovowap.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/5535352905.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6mt120bvn4rh87q45so2uklgnd/relizu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39ea46a20---50373374754.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/44622238876.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/konami.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/28292983795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+recorder+old+version+free+downloadPDF 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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16584 bytes
SHA-256: d8d9787edecb1c9a822e99a8373a45fb6af4a92832d8ce19ef43b82022894bdf
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10556 bytes
SHA-256: cb3a8c2298b867c07259d963332ee0675ccd7a6c2bb846dedd7713cd20417c42
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1