Malicious PDF — malware analysis report

Static analysis result for SHA-256 839e9869469c84ba…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 08:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ca63787720e9d58d5cc20aa519c70f40 SHA-1: 6cd01d0814ffc99df7541028d0bdc5f89b236eed SHA-256: 839e9869469c84bac877b553fca3afed9e9dea757792f5f6c5cb55080ff12f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This suggests the PDF is designed to lure users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/641bd07212aaf295c8b08d1d2696d611/45352999730.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kq91mr03rvnrdt6s4lu3872npq/72772513753.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/16271371738.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/63663066478.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/fikotijusimepolujiv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/judagu.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/46693597300.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ca9ed04df12cc740a66ebebb031ff3c4/nededunipagikema.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/48846396967.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e2f6470f008aba2ee1302f4572eb1bdf/sorezakuripetepugovilu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/xaxudotexe.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/mimowezi.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/3851642676.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mu8hoerubq0drer5sg61s4v2e3/vajofagikafamuvifinaxev.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/mumelizal.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210506164435_1414005558.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c45df39241d---zezob.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/70873236065.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/16888618639.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38dfd024f4---13381873846.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3d34516dd0d4addb881d9160f6139114/wewunejikanemupas.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/83869945993.pdfIn PDF document text
    • https://artbynela.com/uploads/file/bakemirusezuvobekukigaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lspdfr+0.4+tow+truckPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10576 bytes
SHA-256: 6592d7c5b96777e8003d9f8fc63b7d0bd3ad8e35097670c351ff3d6d2e4be563
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 18096 bytes
SHA-256: e91e0d4e18331d1df37d12fb8dab70b70ab4c3ed7665c8454f263d13448e42f3
font_03_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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