Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba06f1353f46150…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 22:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1782b12485acbb404f784f110cfc8953 SHA-1: d60d23a8d31375ddd2602155c46cd62aac302bb0 SHA-256: fba06f1353f46150535318a2e7f1508145691b17df09f9c200e8316ff0f87190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm pointing to multiple compromised websites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure of the PDF and its embedded URLs are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=push+and+pull+strategy+in+marketing+pdf PDF link annotation
    • https://phnews.ro/files/file/xuxodawaruzewafuw.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/a4d1o36dp0r73jalifrlgjs81c/xusamumegokaxipebo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/wubex.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rukulasugemasov.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/nomisuseraxigikuxejidisa.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/leder.pdfIn PDF document text
    • https://soechi.net/userfiles/file/lizofabakokabumu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/17385297721.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/97879830056.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/wojojinomogulalezomonowo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/6147753971.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608de6454ed08---75490383964.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/vibupowiwalefoneze.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zixovukofegasozomid.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gasororavinurawo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dobus.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd439f4b11a---fasexere.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcced7880---44349006696.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xanojup.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/saxuvufiguzukiwejat.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/30m5am438kuq9u1ibkejeb5m9u/90104437433.pdfIn PDF document text
    • http://synphabase.ch/upload/file/rupasu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/6992059856.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/boturanak.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b4322c13---kipimate.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 11132 bytes
SHA-256: bcf281d857424ce7c134e4d50b72d4bf81662360fb13a09ebbef6248108f5520
font_01_sfnt_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 15072 bytes
SHA-256: e9a92b7c293cb974fd6cf1b12d3f134bfbc3eebed2feac28a5e90c4d7913e2ee

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