Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d267ba179c2c40…

MALICIOUS

PDF

96.5 KB Created: 2021-07-06 19:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 222332b22bc30cc868a758e41cb03e20 SHA-1: ff759a361d35e0533f43310bef31f6db16e57803 SHA-256: 40d267ba179c2c403c61bc329b133c582d0160351eefd1d459c7715240cdd4fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=the+electric+horseman+1979 PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/c6ib5rpbpcc29jgefn7ebeagfi/zevijefebexuwufa.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/71967016854.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8ffb76hq37k1h4qj6olkdhpej6/vuxupikezeninopej.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec7c84dbb---taruletudewasusidomo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c1b298241fcf7b7ef9ba1e454a47926b/32076481697.pdfIn PDF document text
    • https://kultmotor.hu/images/files/37730486496.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/51i6l8e8b0a41lk1dn3ajsuolr/legadaregefuv.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/52780621853.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae164440f---65986615750.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085f122028be---setezep.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa3411dbf---8751431508.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866a024047---nagetikajazalim.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e136068ff6---xujojamo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a17ac195d---dolematopovufipulatamuba.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/11829061944.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f376f4f811---83059170681.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cfa0df8814be201df799e8f6ee8369a2/98526243831.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/81449712488.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/65594052947.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/16a04cc4fbe1eeaf9fec3ecc4c9a694b/wilowolifixig.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/84dce03a161f797dfa2e8f67718fe1f8/35106398677.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/21803126001.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/96016349746.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 10728 bytes
SHA-256: 1091cf19dfb46ab86be2210b9d9d0e023f125e4548730e91b6e3fe4566ad8c0d
font_02_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 17308 bytes
SHA-256: 94e6cf7a070de60eefd1faf46e33c267e03ad78b72d93f974e21170007ed59f5

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