Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e4a2aebe75fe2…

MALICIOUS

PDF

82.9 KB Created: 2021-06-26 20:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 43b907d18a16b0988a2bf4284054836c SHA-1: 69323471ba0fa129a4daddfb5b0978e0bb0b2dd6 SHA-256: 051e4a2aebe75fe2b9597ff1a060d407e29c2c5e70a1523feb719f2e8b9361eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external 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://chcial.ru/uplcv?utm_term=high+cortisol+levels+in+babies PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4cc871dfd0c4cd21db68c0e77d85f745/80867493791.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/jamik.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/69451607800.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/gubebudajetuwezu.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/7435141739.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/120923c25192d25fac21f07651e42ba0/62778692929.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5ce4b420f61a9275db13d55c31d514a6/66321507472.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xazemojuwebidimenoga.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pcbhqd8mmmiktjm8grgmcf4ih7/71011386580.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec454604d---didulafutuduwemu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bad980aad4---46800994788.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/bikagawarolarawud.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lekudujijekexudigo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5ad117dca745c7b974d46ac8c5fd741/sozuzage.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/77dcb9cfc4b415469464af13b94a9124/pimaxavegininatewiwipozi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6c7bb90c282e7bf37b94a154c615cbbe/gunoginefepotuvozobalev.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xabopas.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee00ee140---bakirekaxotutevix.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i37pq666aq315i1g91efqlijip/40137244935.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ad0014425e33786b6d194a42120e4a1e/podiwab.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb47c9a8a72---gegilasadofeforometa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3aff719c8---zaruxefoxozivuf.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/38364168110.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4ab64f58b6c4585659193d64e519ce7c/8674629719.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sipelifoxuziteve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16920 bytes
SHA-256: 4fdf6ee8f748ae8614f1794d26c20d9c320763aeb7b5e134017eb71477b5a00e
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 10704 bytes
SHA-256: f552818b774e0ec646887f735ea3b666b730a8356af7ef7ef3b219ed6af43101

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