Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b80f255334221e…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac92c83cc39d851eb1a90c81dcf13b6e SHA-1: 04f39947fdb3c88ea27a3156698715edf97c1999 SHA-256: b8b80f255334221e276fc4384952084b21f7e3c6c30372fd837a63dc55a7eef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These links are likely intended to redirect the user to malicious sites, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kupelu.pdf
    • http://axiomestates.com/userfiles/file/visodoniregimik.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf30aaf42---regodominarorujiporop.pdf
    • http://altaprecision.com/userfiles/file/66547572065.pdf
    • https://balajitutorial.com/admin/userfiles/file/xesilezutirope.pdf
    • http://doubler-son-capital.com/photos/files/bebupifavigi.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7115bbad88---53566055101.pdf
    • http://sl-light.ru/design/img/upload/file/wijivifid.pdf
    • https://promise-land.com/upload/file/90538090864.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722447b8762---bukovolomawiv.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/97d53c789ebdbb5ba559e49ba0b78a93/sajilugojiziseke.pdf
    • https://laughteronlineuniversity.com/images/upload/files/20952923007.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a120bed2c---guxupenejinafegafepikibeg.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb3c7e6639---sirusazamemebesonusafibap.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609499db3e00c---gojaribirunase.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cc160255c87f139b71f544eacf7d2c1/fojukuruxamewo.pdf
    • http://davidhammerstein.org/userfiles/file/8424165932.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9e1218c---totezojodebezogupu.pdf
    • http://cmtsport.com/pliki/nirigegimebovo.pdf
    • https://m-isc.com/userfiles/file/mirulugun.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93a03b283---77343731005.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/op6i15tvajebghqocji4hd1r5e/17350448607.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/41926430081.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/is6iv4g03onumrdr5apcgner7m/zigesipojuf.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/08e53f36ba919af25d948e9d0daec5a6/pazufikesali.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chi+square+test+is+used+for+what+type+of+data
    • 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_off0000e729.bin
bf1e991ca1f6f770ff3bb4424f2c54ee59b56acaffbddce70608342d6945b5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10924 bytes
font_01_sfnt_off00010089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 16792 bytes
font_02_sfnt_off0001189b.bin
e56a2a8e94d7ce1ad6a696ed7bd42629ddd50210eefee757df68b01087923211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 17092 bytes

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