Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb434984124ef562…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 07:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a24aa679c379e152747b6db28d8d5b4 SHA-1: eba67b1750b26273fa5a296efafcc07deba7ea95 SHA-256: eb434984124ef5625286e430b6c78dc1fcfcfbdc45d4685d6ca1b12b45111558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or directing users to exploit kits. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=ejercicios+rectas+paralelas+y+perpendiculares+primaria+pdf PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-7-28/20210728194206681653.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/xewunenideb.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/72955787874.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/18010633738.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/bujefu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b3ce259---xojiniveta.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d9a28925---4072053577.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/up0hds94n853rek575jdcqnka3/3281795828.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1a3tpgsotq253edjlhnovitemk/xozenemobuwa.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7a81a1ac48---kerijufefof.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/widorat.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cb974bd2---tebibekonujageretakape.pdfIn PDF document text
    • http://sushi-belovo.ru/files/lekinaluwomogizojare.pdfIn PDF document text
    • https://spacio.hk/attachment/file/dubasajagematukovut.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/dusukinowegodasu.pdfIn PDF document text
    • http://anpo.vn/upload/files/61938892483.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/27a584ec6a71148959255ea73f0c1630/19147072576.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/40274721171.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/99816566544.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/fixuge.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c2dfd74ac---tevovelelepiweditogun.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zofilalijaje.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2cfaa77483ed86c44f7297d91f07b399/23520382692.pdfIn PDF document text
    • 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 19908 bytes
SHA-256: e1d32877fadbe9c328306a71a4382ec594a8e0532d48710d98af4484762a1198
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 11108 bytes
SHA-256: b921fad3b9eefbd8bc29630810793629fd7525a799fb5d0d2bdcee9ba9fcdbdf

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