Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393a3e8785b5556…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 15:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55476696ae2296cf445202d8423f375b SHA-1: e8c40a8cd5c2b3877a262ff8505fa2f235518e91 SHA-256: c393a3e8785b555659c3cc016b60d8199067b10a825002dfe36db77f943b3e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, likely facilitates the redirection or exploitation, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=cuisinart+smart+stick+owner%27s+manual PDF link annotation
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094930f08d2d---66596414696.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79ab59a98---taxumowesopademupatabezad.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4macboeh02oqk9se8n7ej3g21u/jatokefubomigifogi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/59991013733.pdfIn PDF document text
    • http://dnepropress.net/files/file/60520492290.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4ba8f6094c85993a6c6d52b33d08bb86/kukafilori.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/80706390135.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3503248f---50264412604.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/84960358893.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9519e7e5c9dda6078443df27a82249a4/52585222211.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/71d63ccc709943ba820125cd052605db/kivulojekikowatotawojiz.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd701ac7---94412994996.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a4atmt7kml460fbk4739kp15dg/xodirogamazugu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/03pg8o864v1jm4bljpfgc1eg01/pizapowojagofevetafokagu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/paxetabenanobiwiferikuzo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/66818384617.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/kiniwuzoxironeter.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/14209033995.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072916491889.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080107e5d021---mexalonazevorusavu.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/86671266854.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/46118121896.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120c52a003---xikita.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xolatazalojewolegamun.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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 10736 bytes
SHA-256: 9c45ae651af14dd388efe354b75ee2ee2610d5c4b3c1c974201febaaedad2c34
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 18128 bytes
SHA-256: 1058e43a73105e92be77a1a0bc6a52167c6780f4600b80b0c6a867bd6c1aa06f
font_02_sfnt_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1