Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a8a59d0525db5…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 02:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05caf3e610bf1ded824cd8ac6b4060ba SHA-1: b9106c3af3357f1e6b75f72ebe57e869fc41548a SHA-256: 475a8a59d0525db5ddbad1d4abc38f0d64ae1233e34f693fc9ea10ca26d56565
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=modroid+amazon+prime+apk PDF link annotation
    • http://viprealestatebrokers.com/userfiles/files/70082012451.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/wigimi.pdfIn PDF document text
    • http://lagrupacio.cat/file/zurekaraluzigujapizu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gigusuv.pdfIn PDF document text
    • https://jin-ji.com/upload/files/56333270715.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d438b78147---50150557813.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/54645418790.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337973d4636---52340249457.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/64201017553.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/69768521425.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/42005437359.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3dbd8622a96bd5518fac991e8da9f04b/zosugijidonefosesaregam.pdfIn PDF document text
    • http://strahyi.ru/images/file/73064097688.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/tarajemunaf.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161400c05b2134---borapiludowuzumuke.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/17539883631.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/436273bcd5cd8d35ceab51f65efe710f/vunava.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/mevaloxajejuradatisodit.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1f7a1a46---14139323400.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/vazovur.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/53941469343.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614001f6dde38---xurabafobutonil.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/87131555007.pdfIn PDF document text
    • https://mimpidia.com/contents/files/19001940438.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/wabowaxutugit.pdfIn PDF document text
    • 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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 18368 bytes
SHA-256: b6419c3d27cb09c02445c2e93b0cc4385c837491323a4438e1b8e14312a09109
font_02_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 10388 bytes
SHA-256: ab3d3782506e25302f5a5bb942f97335ea8702ba0c66369336e36b911077e41b