Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef3842cd3b9e162…

MALICIOUS

PDF

74.5 KB Created: 2021-07-04 03:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58c05c8d061394304ec9754c7cd86c1a SHA-1: c23730d5f62c90ba0e68ae380ee3466447fa28dd SHA-256: 2ef3842cd3b9e1621d8739e028d89265c65ad4b58c5bf2cc910b180373ee0cb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ao2o0sht21m1l1aahism7ct9mo/wepojipuravetu.pdf
    • http://kartywspomnien.pl/uploads/assets/file/samijevomupalenopug.pdf
    • http://strandedtattoo.net/file/bijaxepipozaridabukaxew.pdf
    • http://englandmatchshirts.com/assets/file/towepirixuwofepefi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc6a03500---wedowod.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e9e35419---mitutotezevozogare.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/86609279220.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc8bd8355---vukulawek.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/38d9b296aa2e7b5bbdc23675d3fd9fcd/nigudexawonazeganevakam.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/35692654133.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef2c0801e---288471416.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd5c12bc0---1084090935.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9e4e00bae7d262ca923310fb2229a9a7/48742266301.pdf
    • http://geologocarmignani.com/userfiles/files/susotugofoxuzuti.pdf
    • http://aaaexpressac.com/userfiles/file/mapenabus.pdf
    • http://szao-spb.ru/images/news/file/neminamitudokudodaf.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68e78eda9---bujedapuzorulofagofux.pdf
    • http://cocoal.com/uploads/file/28009404201.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2e4ce034eba482aa5acf5bed6d66a115/75861778168.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/8377102601.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0ce9091---21387087431.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7ill14itag23tcehjnjd93jja1/13701384057.pdf
    • http://apvn.info/userfiles/file/warokemiv.pdf
    • https://xlspandoek.nl/userfiles/file/lesisajevev.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedfc213fe2---jixumuwitijomu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nm+game+and+fish+proclamation+2020
    • 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_off0000be49.bin
ab7bf5471e52a8c6086f8b615a51ca901d5eb00cac609e141657cc1a13b125e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE49 11284 bytes
font_01_sfnt_off0000d862.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 16792 bytes
font_02_sfnt_off0000f074.bin
786d47a9bb12f39742edbe181cf4f94847edafb6390344163c68a16ac855acc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16456 bytes