Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f295b4d5d7120c2…

MALICIOUS

PDF

80.4 KB Created: 2021-07-06 09:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d321549931efaaf9a146ca68ac3b4f3 SHA-1: 1b2a0a9749b5d5068ac9a434ec452a0727007681 SHA-256: 5f295b4d5d7120c2b6c2ad4873ec4c93f36a8eb04a2514b00f7b13e4bee11e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, pointing to compromised WordPress sites and disposable domains. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=funny+classroom+quotes+for+students PDF link annotation
    • http://adria-ex.com/images/blog//file/lijubagoropolabujegorosol.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c0cfa7d784ab15a3b16a7218b6deff15/lepakajukuxogif.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a87d7fbc470d19b8671cc9b6ae99ec28/vevesubigiz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2f502a87---74409782756.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o0lrbp0im8987bl16ta5avaldd/fulerepoviwakevijupasode.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a068b982d8c---95440590334.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/576a3966019976c7fc85c2710043532f/17826522198.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kozonapepivivasamuzekos.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/13vc1hvipvudb12kqolstqc467/94662285366.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/1615564517.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mcscnnrcc27qe62plkh7upt9f3/74166781508.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3250f63244caa34867dd9ceec78a681a/35999409566.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/jorugig.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/84239858952.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/najanavi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mapejisolesowivenupuju.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210614/0936549628.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0614027f---basovefurufurutatex.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/datuxinusodivi.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/14973744902.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/woruxirimosonegoleperime.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ea51618dce75943c7d84f8b60339dfc/femuvukumorikak.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/22f32d9ff36c9a4803826b532407169b/93036801991.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32cb9703bc---rosam.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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16872 bytes
SHA-256: 2e77851ba566c7e8ba2f47d55f066ac1906c354a8ce3f9e37676d07926d97340
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 10884 bytes
SHA-256: 0dcf24072e516d849bf33335bda851c05b90dec90060f4d8f423472dd6591518

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