Malicious PDF — malware analysis report

Static analysis result for SHA-256 126dac44d33ecf8a…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 04:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e99df9f6dccb358cfbba09dd0379297 SHA-1: 08f3449901fd10971d914e1ca3adf6b17ee29869 SHA-256: 126dac44d33ecf8a888074a511c11f2ad8462b387c56f1bf1a6821082f8d2a92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/vebijep.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/33353571865.pdfIn PDF document text
    • https://profesa.net/userFilesfile/jetifojip.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/83987131164.pdfIn PDF document text
    • http://tai-group.com/upload/files/88258862463.pdfIn PDF document text
    • https://areicon.com/images/file/kobujesalivajafanonagosa.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/66798937325.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/90441553609.pdfIn PDF document text
    • https://coevent.ru/upload/files/61109079419.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/32883243976.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/77838711633.pdfIn PDF document text
    • http://st03.it/userfiles/files/rugobepapikopesewedezoniz.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/40651939598.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/vezewoledigemefebos.pdfIn PDF document text
    • https://506hlapeta.com/files/file/20689421361.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/061a1b16fda125795d4d77d72715aebf/woxilutofejem.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/devigumukevej.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d6d96f76---77170357625.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/72173539589.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/segidofo.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xobiki.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/bapagevunililufepuforuli.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xajasawarikaxugaluxuxedar.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/45065692168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=love+net+apkPDF 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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 14260 bytes
SHA-256: 307593fea97f748d74788de49c22d1b78d98fd1ed6f1e236148bf2f3b11de736
font_01_sfnt_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 9952 bytes
SHA-256: fc4cde38f57ea72f4e68e77a4a40612a84409f2fa252f4300c082300b1f212a3