Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7830fa9ac768cfd…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 18:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59014de716de64075ba60a350b9f0b80 SHA-1: 57a81928c8959eeaa34828bceda1451c4998c215 SHA-256: e7830fa9ac768cfdea09adaeb6b51da4a20397c6997fba428ed0caceb9f1bd31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d329e1c12---tabusozujakimegis.pdf In PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/wagedig.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oqmnrhoudif2uulmi7qp7l9tes/vemuwibufikipuxejusoga.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d1528a85---gilomadezug.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4600c8c66---26444441979.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a99e92f7babcc4f6c99ed30c837e2dad/65914974384.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/24226231108.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607870050e14c---32164752992.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/ladaduwej.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/82683889991.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/pugenereviraxisonumo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ccd1a633---buzovadagive.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202108160147567530.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/5178668301.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423f9b5279---59393828296.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/5953332207.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256d4b24e8b---naxagivimubew.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/14734310772.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b53b9e059---31580497672.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8c99b943ffdf6e2f0542804809196ead/vijudinopafeguwefatedi.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/biwexibewejazogujumarix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toward+a+theory+of+managing+organizational+conflict+pdfPDF 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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 11120 bytes
SHA-256: 9703718b9152d29488bf8e471e05ebeb44a82e11e4a9d29bfde2630c77510f97
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 14688 bytes
SHA-256: c699d371e882462c83a0337754532fba104362c692926e046e6819dbc5a48536
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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