Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39856f755c40c9d…

MALICIOUS

PDF

86.1 KB Created: 2021-07-15 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9c4427f9a6ea628928899608a8ca74b SHA-1: 70ef893f5751a6c2e6948bab25828d04b1440d3a SHA-256: f39856f755c40c9d9da0884144c540b86da6d21e7142b48510b1c6905b7e93f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=how+to+get+minecraft+for+free+on+apple
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afefdcd5d---rapijutamenufogamisi.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k69q45ceu02skitcb1g2glqk8r/68784861006.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a385364f6adf43c9ab6e949e3ce47de7/50325124809.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccd91dc88---42902994946.pdf
    • http://dakmet.pl/upload/kanazuwulat.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a4e8cb6---xijinoxunivi.pdf
    • http://barudan.hk/UploadFile/file/20210625044902393.pdf
    • http://bulongvungtau.com/media/ftp/file/banoboxutozeruvufexuj.pdf
    • https://notrepanierbio.ch/userfiles/file/575660902.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/kobefojafog.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6d09dc02e79c575d08a22795e51d1e97/kaxuluti.pdf
    • https://briljant-maleri.se/UserFiles/files/wuzaduvaturitulemifopowo.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0bdpg733fieevth6p1tq1l4l03/rumugurumofowala.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b94448513791abc3fe26e6c6f4d8e3f7/97542332206.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c793811cf38a9038dcf9cfd6705c43ce/xepugiredoz.pdf
    • http://sjhrz.com/images/upload/File/23377324096.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0204fbcaf5---99190070295.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcfa165df---vaniwenileliguzeronuru.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a1224699ad6ac227069f928415fa56d8/10538276313.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ncqostiml05ac09p3ovol0pkk2/64764265126.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5a75e89e---jufidironi.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c0efaf13b6cfa82cf21137c0e7a18506/96651567271.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ee89c27d---28709503074.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/3b9d5614cd0384d63a7170d3cf2d7b77/58120861056.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee33.bin
af06033080b420fc9aaac1938843be58b4ae80a283709e99d3605fe7e59c0b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10732 bytes
font_01_sfnt_off000106d8.bin
977e81fa08f8d0536336be28ef11ee031083ba153ac3122eed8229e951fbabf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 17144 bytes
font_02_sfnt_off000132ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes

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