Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40cdd511ab93d35…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 12:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd2379cc9c7c9291ef69a6397f877321 SHA-1: 341281c2940ad00f5e27c1dd6c4a8e8f118ed02b SHA-256: d40cdd511ab93d3583a561f294c9fccd861373173a3e3dd36083bb5e358959e2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=electrical+power+calculator+pdf PDF link annotation
    • http://lafayetteconnections.com/clients/52818/File/36330839098.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/49994875242.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/burejedotiladij.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/garipa.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e551e4811---lawelebulumiregodoremok.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/daefd6a420c79ddbce1a4159fc7d0ba0/7089958070.pdfIn PDF document text
    • http://mextro.de/upload/files/radedowibodiguwedul.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/babawukivixo.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/55694200741.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/sijizaba.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/99315933999.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/65127063467.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/fuzorutol.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/xipibefusumesobadalosu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/37ptf6l5df8rhmhuc5jul3gosu/51455925763.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d796edaa4---88931362502.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f9217543b9c7ddd2c3ab8b37651b8788/99961888516.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/zabexovo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a16a10330---62986828323.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/68112999696.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dafejadufevekivove.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/24320363817.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_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10512 bytes
SHA-256: c05b8022513bd339057f4226bfb7ab8e1f6838c8ce010ce2186b277c0541bcff
font_02_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17020 bytes
SHA-256: 400fbaba27e51f4698cd0ba5241bba60ae5ef145e37b73a370cf52358f07173b

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