Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4426b009ade2b5e…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 03:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2600ffb9bca36ece67c9031549a1fe7f SHA-1: 7b7c93a57d800c952b0c7c8e03b6fe5683032956 SHA-256: e4426b009ade2b5e742ede3a4dfb3708a741387bc8fc416bb5fb00b79a24a542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9b9efae420ab15bd6f20ad05ce9885bc/87530594725.pdf
    • https://alternativecarrepair.com/userfiles/file/1727898702.pdf
    • http://booklandbooks.com/userfiles/file/ridaxepidademinipen.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d59a202351f2b519948ac11b927c1aea/61159741430.pdf
    • https://ecotranslation.ca/upload/editor/file/zatizurew.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1cea832a---gepizawegeloxasor.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wajezupu.pdf
    • http://albino-pitti.com/pub_img/file/xibuwibowexofupivurogazik.pdf
    • http://rauvuonsach.com/images/uploads/files/fekuzolarukuw.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/acba40b61743beff1a8e390c8434c9e1/63352605278.pdf
    • https://aduanaldelvalle.com/userfiles/file/sibolafase.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e731d199d2.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f76fcab2ccb6ee09fae4732f815f5a0b/18842805540.pdf
    • http://udemadriatic.com/userfiles/files/lokitonaparerolegifo.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6bd03259e56fcfca955bd587264d9b8d/ruresiz.pdf
    • http://sewakendragroup.com/userfiles/file/xotitogotonujuxaxuro.pdf
    • http://waterreducer.cn/d/files/bewojosonojawoxip.pdf
    • http://alituncer.com/userfiles/file/repup.pdf
    • http://ekhoron21.mn/uploads/files/12313858772.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2bb684ca9e4114fd8992085686a15e4d/12968201301.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/89237c6da4f55255f81a53fd41305f7d/14136640374.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074081945a02---30369916655.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d2cbd41b7a4503af00111478b73446cb/sogeruturexudabaneni.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c840c57c04---juvaduwavelugifulowegu.pdf
    • http://mid-europe-ex.com/images/blog//file/56014899618.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=photosynthesis+internet+activity+worksheet+answers
    • 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_off0000e9e4.bin
66d4a9d0dafd269021b232568d71ebead0eeaad2eb352d7cd4b2da2e974b381a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10640 bytes
font_01_sfnt_off00010255.bin
b40f7efd0bc1dc0bbea33121dcf0d1c17d0def1439799ca99cb86791f2c55a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 17128 bytes
font_02_sfnt_off00012e9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes