Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28a9e0c8030d779…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 02:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0e91f55c856b23a6655dc29282daa74 SHA-1: 918f20ee982f866049002d915388e1eb4cc2eef3 SHA-256: e28a9e0c8030d7799042e99048996d4e69c33ae366f463fcee41fa623994109d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.pdf
    • http://lawyergz.net/uploadfile/files/95992074605.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75240272621.pdf
    • http://sysquare.com/UserFiles/files/74361580528.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/85092656688.pdf
    • http://xinghui.co/upload/ckimg/files/202109062256591934.pdf
    • http://portaldo.eu/contenuti/upload/file/banenalixerufita.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4fde4a26f19a7d25e19228d3f5386b33/28664145692.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/kiludajiraximi.pdf
    • https://rentcar888.com/uploads/files/202109012354417221.pdf
    • http://sino-web.net/filespath/files/20210905211322.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c5c94mdf361760q369fql4np3q/pivujififavunesarozoli.pdf
    • https://dadrarad.ro/userfiles/file/selaragovaretamelakuwe.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xasibe.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc1fb0e45---xujonapobopomewufipabene.pdf
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdf
    • http://paulgraphics.paulsfashion.in/files/38516055637.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/58426106024.pdf
    • http://canadianrockies.info/files/file/zugoxigefegixonu.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vedagedalisagerezokori.pdf
    • http://geoscan.it/userfiles/files/53565498147.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f78c115b04b4924849845943f4bdc2a/61090836589.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9ae7bb34---69206539292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+spinach+is+good+for+thyroid
    • 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_off0000f659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
font_01_sfnt_off00010e70.bin
0e8fe5a70ecddcddecca09f9ea26de12c33341b599bdb7ea1178cea6c0b8659b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10784 bytes
font_02_sfnt_off00012705.bin
7fe4718cd34f566a39dd01dc94c92891eb3cbd279a6d3f6c1d889d236456b550
pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 18324 bytes