Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ab210c20517f0d…

MALICIOUS

PDF

93.3 KB Created: 2021-08-16 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec42ae67087b6fe40d255a32630b0f00 SHA-1: 4238b362b3ddaae4fd9aa68a77a4db7c3fc0b8a0 SHA-256: 24ab210c20517f0d01c07250f8585b50280d890585e12ee0783066e4f73aba23
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. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8840f1cf658dff7b0e8f9501b4a73c54/11008867949.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070493f7abb1---16760601340.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/sujoxanimos.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/96800564822.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071de8cb1ed7---fulimojuxuzepenemavoweke.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f927b90b25---92851108052.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/masabowegepudotok.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/76480593592.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/zajobilediwajomaz.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/xizidexafofazotud.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7e6jnas1u49mp76pr1imj3cge1/rovegijuravigudifiwobire.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kexoborut.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1683c31218---99753714766.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/42276778544.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf0cc4508---bujiniwogenef.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/97957a08442b43309d94afcb90f6a1f6/3055694445.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/32937243666.pdfIn PDF document text
    • http://camwater.org/media/files/wasezejaluseduje.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/68877010804.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/riwitikefumowow.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/xeribopanoniz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f855b766---rodofosekixok.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r01v95rbniciupjtnsvfmef9du/xaropalasewafu.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/69938994046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+wife+story+packet+answersPDF 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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 18792 bytes
SHA-256: 0232441b486279ddda8c98e68d30002c8c220ea1e805fc836599d5e871768e10
font_01_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E41 10788 bytes
SHA-256: f31b5c5b779e78c19255ccbcacd5351de2d77f1627b3513db821b5f164027707