Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a488a24b5da20d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 04:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d65c96fb7e4d7a797c35716fc6760ab SHA-1: 8cf0481d0ff928bb926155018301732af8d13bd6 SHA-256: 22a488a24b5da20d7e43adae22e869930ddc1197a7d92b95e137c6a0310e8d86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest it is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=can+i+use+a+firestick+on+my+laptop PDF link annotation
    • http://kientrucnhacuagio.com/upload/files/wexixefejerodoronatij.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130322f61974---38915978153.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/gozamiweput.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5645903374.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/04d5e1bccaa818a6fee2b4ecf211985a/kebasovebiwosoze.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kepoki.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/13171672048.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20877834478.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nidolefokogedali.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/fozewotobaxofakiga.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce18e6f4b---93681364251.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nelepu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/73257143870.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/varamuzilogor.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/26561993764.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/88612806160.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/41773802115.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/75296574508.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/71481728663.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/situmiv.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_off0000b302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB302 10976 bytes
SHA-256: 66ff1482b4de58a323af8ee0ddf1825d9ca7c384a412a42c5118c4f35ba02acb
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 15976 bytes
SHA-256: 540e0e2a754d207d10278501fa42c06bf0b900484b43d19d35fb7ea5cd897c55
font_02_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1