Malicious PDF — malware analysis report

Static analysis result for SHA-256 223cd497b20601da…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 17:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8a913d2a3df6910e34c85849ee26f62 SHA-1: 28bda91db4d37bbe20edbc3570c32aa8c484e816 SHA-256: 223cd497b20601da38574748418a46844afca4ff178fc07e7dababba353b311c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=iphone+8+plus+bangladesh+price PDF link annotation
    • http://www.enredmail.com/templates/files/idCliente_/file/poxepowijewod.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88532bd13---dumoselew.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/20161094481.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/45442826828.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/fosekuxovadamaxodapovufa.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/darogezapojapetider.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/vuretebukabumawujo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/82522916313.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/wafebajamul.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136de0a3b87c---46491686568.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bodipidanemi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tebiwofebufiponopiven.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/valogonozunorekewafop.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/91698390114.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/90779238010.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/72557695555.pdfIn PDF document text
    • http://ave-france.com/pics/files/76093342132.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4735234e---sizuwirobitevukasopev.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/27658169276.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/45153902185.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bedajelugodisidatixuxe.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4d1633e1c7af9d272675526a89b2b2a8/rodavelaviwufez.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/tipegixigazobiweso.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/40479292783.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/53790206283.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/39161577404.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 18956 bytes
SHA-256: 451b9bf3bac87dce7f056004265c6b2138f2394b22ebaf2be278a3f6dba7b61e
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 11092 bytes
SHA-256: 222cc4d779ecbe340b4e3b251e7f69cc6b9d20da982fe464565f22bbd96502cb