Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62762cdc68a8b74…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 06:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b2e6287be5b95917b85974fb508febf SHA-1: 7a4e54ba2e8e0f860489e338077675440b93bbfa SHA-256: d62762cdc68a8b7494a38175733da42f3b30ea1a505c5e6f4df04df6b0b1c65c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to lure users into clicking links that could lead to phishing sites or malware downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • 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://studiotecnicopetrillo.eu/userfiles/files/limifikaweziker.pdf In PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wajisejiduteze.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5d398c31a41a919a818d2cdf1d8f5/mevudifakuvelalugeguse.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/gapigujubiboxirozag.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/nelajezeruxazovisusiwef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfae85927c---welegatejinajakisinaz.pdfIn PDF document text
    • http://ukrfirework.com/images/file/sogubibazabusamutuzewada.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903015107.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e44e2d377---siroma.pdfIn PDF document text
    • http://elitacasa.it/images/file/tesevopalogaluditexaw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155729f6ff80---63531019771.pdfIn PDF document text
    • http://azizolace.cz/images/file/zarezumoli.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/muxufimoluragil.pdfIn PDF document text
    • http://gabortech.com/admin/file/83475068930.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/litujorobabipoxizofuduret.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/zivogovali.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c69aed05f15e473061645756b6f2b671/kudujiwimalope.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vovirilanojo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madezimunavewapegubol.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/tewaj.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/lufodiwovikude.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/xelofumefo.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/80521650162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nba+live+cash+generator+no+verificationPDF 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_off0000aeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 14936 bytes
SHA-256: cb1d89ccd30348674c7a96030d3437fd9e1b36be91b387633dc7e7aac27438de
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10800 bytes
SHA-256: 42010b5b7dd730154ef076ea5f2630729e079174448e6588b7637614331f9cfc
font_02_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1