Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e3e2826d40ac67…

MALICIOUS

PDF

149.7 KB Created: 2021-06-27 07:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1e60f70dcef49bac95a160e34a874e07 SHA-1: 96e312dc682a8a595ca60dfd8608d6b056fdbf19 SHA-256: 42e3e2826d40ac67e7fdec48e53c5bd421c345bb9eb223f78f15ee68e4b6785a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malicious content distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://chcial.ru/uplcv?utm_term=the+vocal+music+of+renaissance+period PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26bfb9dbf---24437728506.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/gogaxilulosidawawab.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35ce5a82c2f6e2d4ac2e059f0fcda8b0/kozibotoxusuvuxizekusir.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/53822535370.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/46685155374.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/kifirawivafodawatit.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078a74b595d8---45057086865.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/176tl3haupsj4qpnidpm1iiq5v/59335705738.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6b0ca29b---pawev.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070c7428880f---xexaminomaluzaliwolik.pdfIn PDF document text
    • https://biocoils.com/img/file/8509859276.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc01139570---87369713223.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f9711145f4f6fa692bdc30dc5964dcdf/zazudejowetowuwodiwef.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ruwovaloruxamuvubaxokig.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b170d446---tukixaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077687ad67b4---bifopiwowadoxilefajolulad.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/78946496479.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/nuseke.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/nutojaxix.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/88742126434.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f9mt88crir4bible8vjhs9kq75/saxabezakevovarese.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bab072e3c---76813652695.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf933e4cbd1---fijuraxuwipimudegomimo.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_off0001e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E599 19500 bytes
SHA-256: 902f532b637dff6f40c0d396db3786d3d8803d1b2b7df263ef1f1cbe47a948eb
font_01_sfnt_off00021624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21624 10916 bytes
SHA-256: 5dab4274aeb3fa3ee0cd2685a9e7a9fb961586a424ac6bb85b70858bbc7c2fd8
font_02_sfnt_off00022f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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