Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75f4697dbb6008…

MALICIOUS

PDF

87.0 KB Created: 2021-08-03 03:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4389a1729780c6f7d57a7ce0e5d1016 SHA-1: 4794674d1b23f87f46e3e670c593972edb882f37 SHA-256: 2b75f4697dbb6008a385ebe61882e93226ef6823625460b63d39f590133a291a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/632aa01b9d303eff615805a10ef0d4fa/buwixewovogirudim.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/wonirapugunaforu.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/28444618676.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dfa6a4f2f---19599368517.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5ed4d044---7663332527.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/72483bbfdfe4fe7dd30e2c2d302c3664/zalelunifizurarijusunu.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/6181284761.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/43024712291.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/84860549547.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/29300273131.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zudabufamolokalokologexev.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/44ebs9t353n9eaa89eplq5qdv1/85122587705.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/9b2816ae0952099629b3bd22c7e9e862/mogijopofuzatetuwubufoge.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/cf3ad058551ece5e79735973178b9896/77079943489.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6d9a86509ba98b73aee1f71d0438ebe4/supigojiruzevufubadose.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/begevagumipeni.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac612c333---73306522768.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vosojijugidu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bcbf688a5---95066023908.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/dabimivo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fb8d5e73---tevigugagotafuzuk.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e74a1216c8ed19e205ae740e01c109f/gafovomakolaxibo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a5e4454765d4978118b793db143419db/42180122318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+do+allshare+on+samsung+tvPDF link annotation
    • 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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 10848 bytes
SHA-256: 4b8cd5aeef5071959a451aaf9e2b5d911ae172083af34e8bb360f920421ea199
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 17160 bytes
SHA-256: fcb17f4145fed2e0aa5ab348dcbba06dbb2aea80218a76331a372e106a081ac7
font_02_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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