Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad536d2cfee00f3f…

MALICIOUS

PDF

97.3 KB Created: 2021-06-30 00:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3968bbf87b3ee132eb93aef263480b25 SHA-1: c48cf45a19f95c7ab962b33bd27666ded740c663 SHA-256: ad536d2cfee00f3f06d190881ebe7dc8fc81d5f8b08e0eac93225e1279fcc97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=rivers+and+civilizations
    • http://abcbyspu.com/ckfinder/images_store/files/fibonolifodokizipelu.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/dbc8f02f6a4e95d0f3faed88c5852e85/65518382155.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6bebf9028554859ad63933921a3cd6fa/pozefiguzixugumikovojif.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b068672f562---wekofelikud.pdf
    • http://greenplanetnepal.com/userfiles/file/selolijixesanaletugo.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/57476ab1e5ac92232c7f8cf6e62e2e85/rafiv.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4871f602---9438627594.pdf
    • http://naturabliskociebie.pl/userfiles/file/suxaronugewuzotolu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac521a0405---xumesunupaxo.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f6912fe5---godavejetewaruresonawotuf.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a42ed7b2ba0071023a898177bf339363/34079127111.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c806039af---rogofufo.pdf
    • http://africareview.in/userfiles/file/44261417343.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f07411950a562913c6f3a079b2ea4462/57596302548.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608862683740a---86192265480.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/46751190309.pdf
    • http://nitexprofi.cz/userfiles/file/35081029370.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cedaeb54b---7815411997.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/954f592ef9f15d97cb0753d01190d416/dodusolofufelodoxujetob.pdf
    • https://africanresearchcenter.com/userfiles/file/deruvudopumik.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa0f6561a---42250434005.pdf
    • http://growlink.biz/userfiles/file/wokovepi.pdf
    • http://optykglowacki.pl/obrazki/files/felevufexigikamakokun.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fe448646fa47a7cc5846078d1cb45c22/zijati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
font_01_sfnt_off000134b8.bin
6fba57757433311fe6afe9fb95bb5a0e3cf3dae964a662cebbb6acef8a7fdce0
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 10536 bytes
font_02_sfnt_off00014ce9.bin
ac6564703c915df612543bdb2a71e80257d0299304600e081c2e835342a9afd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 16928 bytes