Malicious PDF — malware analysis report

Static analysis result for SHA-256 082a5d6082578489…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d239c6cbe4f766f1b33a8125503db1e SHA-1: 2d1b98a5c0728cb83eef7e7c9483bef8b95b6770 SHA-256: 082a5d6082578489533a18c39cec7e805be3370cc019a4dec804e1404d31dc15
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Embedded JavaScript was found, which is often used to redirect users to malicious sites or download further payloads. The PDF also contains numerous external URIs, many of which point to compromised upload storage or disposable hosting, suggesting a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://foto-video.ch/userfiles/files/regadixonarofikile.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/95f823594e793b5f9a86f1307d79667f/suwuzamatodevekiduwo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/89779195409.pdfIn PDF document text
    • http://accronline.com/userfiles/file/90766800562.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/13484959524.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/11130955075.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/24796012024.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbd6565901---80514218596.pdfIn PDF document text
    • http://geodez.com/pliki/file/39789398109.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/kafavevapitefupedazapiki.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113f0782a428---kowavumikuzud.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad806e2d8---nesusunavulagaf.pdfIn PDF document text
    • https://efnnma.org/files/file/rosavudapexe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/18114677490.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3203721e---kebaxogotasunurobiresego.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/94570300602.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vemazozigo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3927bc435d---20707896724.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/wogewogesupesuseforabezer.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfaa958d9f---43284193511.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535e5e762e---zuset.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/wefivepogasebenu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8cqc5vkvk17bho4vv57mnhqbp3/zolujiripifapowavupomobik.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/11959363629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=junie+b+jones+the+musical+script+pdfPDF link annotation
    • 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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 18616 bytes
SHA-256: 3f0966091fcf1535d33b2c442244f1ff433372e2b79b05a8dc655d74ace85936
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 11244 bytes
SHA-256: 5a98171d6a702953f0090552873b05476f81ca84fab5aed858bad9ff7570ea94

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