Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e7da96be03f546…

MALICIOUS

PDF

100.6 KB Created: 2021-09-21 13:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d263dbabde5bdeda4a7a1c0778022be0 SHA-1: 4d22608219d4b888580e6ad066132b2c9c8711fd SHA-256: b6e7da96be03f546103ad2018462227360b7ba1289617eafc3ef452380ce1b41
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were directly extracted, the presence of compromised CMS upload links and the ML classifier's high confidence score point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd5203746---51571157463.pdf In PDF document text
    • http://rmgoals.com/userfiles/files/12685491643.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210919160117.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9640ee7737299f636017f27fc1cc00a0/pupami.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81883304136.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/70372398310.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/56862041289.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/xijujimuzi.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/87224306351.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109141157192362.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/60004661061.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f9f583cf---gilozixuzuxilan.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bfc4cb45e1b1545d8fecc0931ab8a61f/bimujodawozizutolu.pdfIn PDF document text
    • http://susutour.com/userfile/file/7747303336.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614291a51abb9---60965755329.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/7893827137.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mazufokexi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9f9b072de9483e84e6c407960397323d/perekukifabexobaguf.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/28812402153.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/sulobunidek.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/89863931061.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/lutidun.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/13956240278.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/84004498729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=create+android+emulator+in+visual+studio+codePDF 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_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 18764 bytes
SHA-256: bf68c34142f480ea94dfa50545a00baee969820ea9598791cb402bd22d7bd22d
font_01_sfnt_off0001541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541F 10728 bytes
SHA-256: e1768c1440f03573f7bf54138f94a82a3014a6403cef3e122ce502e977a868e0
font_02_sfnt_off00016cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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