Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ae1d778330f52f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 09:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bafaab805d8f14f3ad35d464621342d6 SHA-1: 53ca200de5da50003cf12d9b7764988700d751bd SHA-256: 14ae1d778330f52f29395b562c92f3beee6ac0f1c8440166d6a5ec5307432612
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db594d7c4a---fejuzisuwuvopafu.pdf In PDF document text
    • http://badgerhillfarm.uk/5169718673.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pokinomimadak.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/22898925089.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zajowerotudidunigerijasux.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/mozokez.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/tosemi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/6189694551.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lesobudub.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210909130954.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zikekemadevolelozesos.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131dfcd9d2---29514150852.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d221545b7d8ce63a6bdd025505c5f267/93737233614.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f064e46ab---29710845801.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/21844845840.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/bosukusinelabokute.pdfIn PDF document text
    • http://video-cycling.de/files/file/75452432861.pdfIn PDF document text
    • http://gibisch.org/files/files/salasagagenilomokofosil.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/42819250129.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/58150656936.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/fesanuduwolejawedufe.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/87920932462.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/96007487471.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/palowiko.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/25365146137.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfba5f962---tijuwadefagozup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cost+leadership+strategy+contohPDF 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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 18100 bytes
SHA-256: aab7819572fda6b28b23225089061b51fe20b889d8e203640d6dd826c6a02ed7
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10940 bytes
SHA-256: 2cade4c9133e2195493e62c16d968b74d195e33350084958d5a85cb2c0ddb938
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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