Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b52c8c9f6fb5de1…

MALICIOUS

PDF

95.7 KB Created: 2021-08-21 00:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0c92d16c2aad1b864d0f779aa29e0ca4 SHA-1: 36ad70982e521a5c5367e9d6fc779d2f43cc6608 SHA-256: 8b52c8c9f6fb5de158fc083f7105a567d0f27132d7394d66c3eeaea75e376f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=cuanto+es+2+kilogramos+en+libras PDF link annotation
    • http://effekt-film.de/files/file/vuximopifozaz.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/064c95062d7f4417d56f2ff55f4ac9fc/bagip.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/pekobomebukolusewinejitep.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2a994985bbdb2373446913380ab66c32/pisutidezeginavebugo.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/dinagelesebulabakamoxuk.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/62148362950.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/71074327289.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kijedet.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/resefebezutebi.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/67057835478.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nazetutenexo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v7ta1g9o1meek32ll33rdi163r/dijeneraw.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ad1a6c44d---niwidekit.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/v00tnsuonn9pd4vjc9p22thakb/70342881931.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/nukik.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jivogakajowanale.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/69624801527.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zakewizudor.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf0faa513---28547044709.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/wufevebujivefilafesele.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/liuidmebvtb7qjdpaiflsvsps5/34556227172.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/14064031047.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1e006ea1198e472dea6ab22a407a0d58/lepexan.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b636ebd8291---radotadabijobirabiwejiw.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac32bb3d6---81578570267.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_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 18520 bytes
SHA-256: d0de339d3640afda2c84a4fba63134efdf433cc8ce160ff1ebf540a3430db012
font_01_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10936 bytes
SHA-256: 364ec8a68d68dbbb2e60acdadb4e67bb74ad9a4d8f3c523d3c57a257495814de
font_02_sfnt_off000156b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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