Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179a78c0689f35d…

MALICIOUS

PDF

81.3 KB Created: 2021-07-27 10:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28a8587192a0795b8bea307db13b3123 SHA-1: fa5f18a2d5e3a3c0a32f205fb2b654b4bdf1c69d SHA-256: 3179a78c0689f35da4d7bf7bcc2c53d83b1c29843845202c34da00c3c499bd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://sakaryakasaplarodasi.org/userfiles/file/mivupezosex.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061404314057.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/074d184ea20dd69876683e20af775392/286322324.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091422d21afe---4019413983.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9988c7ef7d6d19aff6c6514b53b7a1f2/63053583511.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/20657926582.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/83489399861.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/42ec8e76d8fc2aab4ffce5ff1c9b2071/bogidumevulaxivitose.pdfIn PDF document text
    • http://nktrading.qa/file/files/80131667667.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69915955779.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0f41daa7---musadomanininet.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/giwopixodopiju.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8afa1bbd5---24723737977.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/vejevoma.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/98228630992.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4019dc99c6c4aaa5e4bbb6745afb2471/62446233756.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/gamurup.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///fumozadazavefatumorevewo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/na8o49ah7vrntal4frpefou4f0/79917219746.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2muso7fma1h5giq10cloe9jrq3/mozidawagojigaja.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/bagetafiguzuvilolebinegux.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/34942043694.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/vesaxogololud.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/34068237299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=k%C3%BCrt%C3%A7e+mevlid+mp3+indir+durPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 10820 bytes
SHA-256: 61afc6cec6f5c97719b9c134748f3bda1e96e0d0648b3628cc3c225566855a59
font_01_sfnt_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 18740 bytes
SHA-256: 672f0515f84b42d56d776a94bfc7e76facd745e30db6c0ef203ee14d125b6984
font_03_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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