Malicious PDF — malware analysis report

Static analysis result for SHA-256 d349df5934eff2db…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 16:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6001ec55d4b96cbfabf25202f37160b8 SHA-1: 320959f30998c2e743a0a9f235b26fbb12df8788 SHA-256: d349df5934eff2dbe93c8f654838cbaab6b2429533f7deb79cd4ec3bf992a5a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://markaz-e-durood.com/EditorImages/file/gulelopupopebizolekanum.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/liwomijuruwitojuxero.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/neganin.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/15894075713.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/455b18d3ffb50005c44654a851626113/pudugepavig.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/57434501798.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/24099924851.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wuzanag.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/5820000830.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7c1c24c1---42382974927.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/lojibofulotizoluditabaja.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/32167823855.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908174801.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613101f882bc4---17277275664.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/94481712902.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lowipekorixakebase.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/22473091211.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/tevoda.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109061303186680.pdfIn PDF document text
    • https://people11people.gr/uploads/File/83765822206.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdfIn PDF document text
    • http://gro-felix.si/uploads/50631951376.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fafegaxomagawuzug.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4e8c07a86d3a34636668527724442f56/wupupubabe.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630879769.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/78229387203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=venoclisis+procedimiento+pdfPDF 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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10588 bytes
SHA-256: d4d8ed2fd76a7de3f3733365bcac94c0ea5b987218538b490abfa7c4ef38bc91
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 18552 bytes
SHA-256: 602fa694df66346a108a40a9071973d54e6b0267f2286e2438c5ef92a3531a50

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