Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb202afbe704922a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-28 07:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f40aa8ccc9efd2e181197105fce68a3 SHA-1: d141703e94972bdc18a0fb20eb6d719e68602095 SHA-256: fb202afbe704922ad65e9e58b1b697a3b5b04d958492108a5ff3e1ca95148f32
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing pages or download further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160757d8b0cbb0---welumo.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4n9mcj6g48229e06qrr00rve5/1491399683.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/10n6qc6g0ahm4k40mie6j6gmf1/58282745703.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2mqe6fkfp21mpoq9eukfoch5m6/xanewomegowuvex.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/22e74cf32e933bf8958c3b0740d86b7e/7406845690.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb95e50bd2---9452153681.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pisokf5aaopn64739gvalr2cv5/62299399372.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mra8c9h0l42r3siaeerdns1qph/gatiloges.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160de573f9deab---fafivowijolulagor.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/zeripejisimemunobojozed.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/vovov.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5e1129f---7727261037.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/13010517726.pdfIn PDF document text
    • https://agermag.ro/mm/file/60414284490.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210530053613.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610099dd13ffe---wenubivofukitaridiwezemur.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5648035762e7f5b6b4382785fb8394a0/zodak.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a838d3375---68018517290.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/maroziloronizitakotowewup.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/74450707381.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/17cjb8qghbthlukiupfi1nuhh0/tufegupuzusesujo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/1570074926.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/771f228a8e83e5c17d08ea1fa6d934f6/24567897538.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/26235905754.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c878493e628---56849828698.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ed1ee3e501b7513e87baa82f1ac9ed46/91975652168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=psoas+abscess+antibioticPDF 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_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 10220 bytes
SHA-256: 3d7f30ecf054c1029c578293067c1c76f8d2a333bc44fdbd2ca125b7edaa9a1e
font_02_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 18548 bytes
SHA-256: 72d0a6b59f93d0edb110948d699e0f920e82fb8629ad654605658c826093aa85