Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd73c5b308816e0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 20:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2527dcbc917acf8b906fd0d3489e741a SHA-1: 07b64c2bf6c4e53eb3bd94e793b3063a2fcb54e9 SHA-256: edd73c5b308816e0bd8bdaaddf9988db0e4ea56adb1df478b2fafd1e06ee1b61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The PDF structure and embedded URIs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=human+design+synastry+chart
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4bfaa863---gurogisalefase.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094503a97aaa---62031443961.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qdiddeob6oil60qchgdedmbahg/45293492967.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/eea226ee98b6c30c79e5a68fcab2b0a1/wositubazebarijuvunakuxa.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/11756386334.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4afdf6f0---wubodegiru.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57424f224---74702782807.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be68a626776---magevudekixukemubive.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882fee387c---natibivokoxiwodiwadakusu.pdf
    • http://sevimticaret.net/userfiles/file/redugaduvifidasuvo.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd2fce691---zakevosifekivovatuvo.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/01k4qoq5gldoi7gka5kpafffg5/nobikezofewerumitili.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888759bdbe0---fegifuxisexadiw.pdf
    • http://liebherr-tr.com/userfiles/file/fafuvusasutifoboz.pdf
    • http://softwarefactory.nl/images/file/figetipimulepexana.pdf
    • http://zwickerfoto.hu/_user/file/17165839003.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf395043998---58811992479.pdf
    • http://atenngo.com/admin/sites/site/documents/nisewodekefir.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a5c4312a---63788050764.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bc62fed7ed7dfc177d510a80be9e9175/luroruwuvudetobome.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce75eb2a2---76826700951.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1238d5e16---taxudixomanetaxepovibubo.pdf
    • 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_off0000efa3.bin
c1935e5506f2e37ffac1082dc3ba3f9447761f09a88872d99da8d830be6d4ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16584 bytes
font_01_sfnt_off00011a8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
font_02_sfnt_off000132a5.bin
2f00142036fa000e5c45530b2deb1caae0712891b89b135bb6e80a2c2ebe7576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 10856 bytes

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