Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed61433d9c7bd7cf…

MALICIOUS

PDF

80.4 KB Created: 2021-06-28 11:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e0d231463acfa5aa7c4afe3516a2679 SHA-1: b313a072d30abb46bf6ddea9f9bbe3fa4bb15ce4 SHA-256: ed61433d9c7bd7cf2ab9a01f6e73af8514fd6afc7341e6e0c7b7de1a4a991517
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=thevenin%27s+theorem+solved+problems+pdf', are likely part of a phishing or malware distribution scheme. The document's structure and numerous external links suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2355

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=thevenin%27s+theorem+solved+problems+pdf PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988535c1f13---mebazabotidula.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e6doqprni95fg8qljpfm3ih4f7/vufodivawadenalawonuze.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd56c88580f---32845290509.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acc93d3dba7---36661788207.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/3976103010.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/pajixejazosamalidigigep.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ccpmi4mo3bka2661k8l2ijkgj5/69633199630.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/91646070856.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3bd314b4564b95ce7c33400f0be10e20/88262775996.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/gezijosojolu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ae470c0a1---97753107508.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dq8urmhn9eo51nbshj5gp2tp1b/denuzimigef.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/82029967463.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/524hh51l32hvr1h7fideuecho7/dixutitizazazosukuja.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/77q27naulr2a167q6hmem1s0sl/99744845456.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d208ebc578e---wakokadevaxovov.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c88baed---72859668117.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/esu5g58qqorpj1m4ap90hq63t6/87916437457.pdfIn PDF document text
    • http://redactron.com/userfiles/file/bulinezakovonupizolodigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46711022fb---16500448727.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/53511275629.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099031f499f6---37029716727.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824dd1e0df4---47095077709.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606212020.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/luwodiriwabuzovukomizi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b44d0eacda07ad935c418330de9c7a34/86230379179.pdfIn 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_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 17576 bytes
SHA-256: 956c930d8f4d8605289ee67d6566c2edb817e8cab30802cb5f2a8d9c05556f0f
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 10804 bytes
SHA-256: 40cd6a70954ace1d0991c648c7fd897cede22f6874dd5fba1742f0435abc6a84

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