Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb0a5440bc5d081…

MALICIOUS

PDF

77.3 KB Created: 2021-08-10 00:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdfb14024a03c5f1f4fc59290349798f SHA-1: 12ba21a13301805c31ff6246c269bf8948f9fd35 SHA-256: bcb0a5440bc5d081aae2fd0594ac80dc78440e1d04290ed89cdd0bb979450775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary attack pattern appears to be directing users to these malicious sites, likely for phishing or to download further malicious content. No scripts were extracted, but the extensive use of external links suggests a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=j%C3%A9sus+le+christ+lumi%C3%A8re+int%C3%A9rieure+lyrics PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0139f4b4---50476059174.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/219bdd5c1084050abf54b691f75bdfca/26518083576.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/muvajiwifosufapabojazam.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://beliangka.com/contents//files/mamesojevalewebededal.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/08063945ca084f9dd00cdbd7be0d8ded/53342189473.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/semumupivumaxovemibuxulo.pdfIn PDF document text
    • http://kezmosas.hu/files/file/vojewuwijikiludifuf.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sedulitemugadumupava.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071879a30764---zilatirotewudoweti.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/7j6tsi6kdsop1on6599raj6ps7/fodazikobebatexova.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/72605554942.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210618_5BEA8E88E5E576B9.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2f9c76e7---77261634235.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39327990325.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffab7f2a14---lumijejaxarafuj.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3e0c95d7ecd0d9f5c68d1e8d8a7cc9a2/laguxivumikusajin.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/97957431463.pdfIn PDF document text
    • http://vuason.vn/upload/files/vomofiluxabufisodasivek.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wuraxip.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/41090484925.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ccd9c060---66874645707.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/35cfabfd9f09876fb1181751afec1149/8749794143.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c463cfa4---7790260790.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/22627270734.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_off0000c637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 18656 bytes
SHA-256: 2ff6dfdd627de6fa03f8f8a2bd390315381a7121e577cf6d5f6e31b3546260f1
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10728 bytes
SHA-256: cbe796e493a0ae51011d642e8a600b1ce060214c43532d80de32a9dd226e1197
font_02_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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