Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37af0ba7ed45d45…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 16:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb460c8e939ca7c0639e8726dda53a2d SHA-1: c0abc12b53dcdd0d5b304a216ad12db177aaeeba SHA-256: b37af0ba7ed45d451f4647b791cbaf8b6c987118ff7c183ca960d8c7710a3469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, forming a link farm. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacf37e9c4---nowir.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607703a37211c---55707364024.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e54db64d5---71540056497.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fb39c01---kilulewakisekofod.pdfIn PDF document text
    • http://aven.su/userfiles/file/genusilur.pdfIn PDF document text
    • https://bataretak.com/img/files/file/22526158680.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnu1lnb12b0443fjsver0fhf1i/vakanolizosabopemefijez.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508f133751---togafebuzodikitibu.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/04d99d11819f5fef86e24a49ab936510/85892455244.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meguwe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608208ac2167e---bezolavi.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/davifeg.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/50161685212.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/naxofimuvisimiw.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/fijevudanogatun.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/34307916430.pdfIn PDF document text
    • http://esistore.be/userfiles/file/73938087415.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad367eaa82---80228827210.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0094fo6ut15rp4eu4quc97j8cd/tozer.pdfIn PDF document text
    • http://robedecreateur.com/img/files/87173830740.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkr3n1podsqusc4m1996ltu5ee/kiwumosedowavizinaf.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f26e8501e9d267197f4e61e94df3716/dovigagosuzewutak.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/pibavaniximarevir.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/32533288798.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/88988649106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=red+and+blue+nose+pitbull+mix+for+salePDF 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_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16628 bytes
SHA-256: 2cb2b9863189da7f647ecf04726ec37285232550837d6816c23dd54b03885d58
font_01_sfnt_off00012bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 11044 bytes
SHA-256: cc34ec16af2a7d37c064dc8cf5a9a5716bbdbb58e0054e757cd452e38d0713f4

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