Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81ce5c58cdb1f2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 18:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf278ec9982cd3ea0616ce737283c959 SHA-1: fb0f567351c95fe126c7a38d7792e731cfb47750 SHA-256: 6d81ce5c58cdb1f2d742484a242777ce72c65d8ec7d5e35b315ed9bbcf80afb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs suggest a phishing or spamming campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=characterization+worksheet+1+pdf PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607463b874c3d---nevubejexu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/61853316172.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ce793f6c---xebigupuwilaf.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70915ea53---41227630028.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f976926a38---42763046326.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/68b97a7c2c101daa6ea10ff0cb4a84f2/mimoraxukewabusifex.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/kutob.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b51a5780---22022684666.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/20241d5c9a5000abfa92479264d3a684/48959340982.pdfIn PDF document text
    • http://thaide.org/userfiles/file/nitowobelepiw.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/luveka.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/28529817772.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/63314507119.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4537473e5da915cdf67461ec94fa029a/sudadozebiwaz.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/369e90a236647395b5d82af7691a33a2/79897289357.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/29758530032.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/40560709600.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/sebatejazata.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/toteropepukikofatij.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d7ac62cc7---95498730260.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/dudalalibedok.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/i5c117gq52gs4u585jhiviak7m/jexutolusefulu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/51474053445.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_off0000b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 15108 bytes
SHA-256: a3a9333c5b56bf43e2d57e61a8e9e073edf0789253faf3b9e489488d2e84b93b
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10992 bytes
SHA-256: c331c7e80b398d43439bcf05bd57905bd8957ccc2c80210199bd09ca572f5dff

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