Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d54bab5745f456…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 18:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1caa6bdfcfcaf7a2846c21a1e648edb4 SHA-1: 44f1d745ce1567f6a003fed1b6f302630421db2b SHA-256: 35d54bab5745f4563e4c1da95079670751e8844942c49f181c46c8d29a4a7744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful content, likely for credential harvesting or further malware delivery.

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://drafthe.ru/uplcv?utm_term=communication+goals+examples PDF link annotation
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/789d8033421ac90545a1f3e871e7408c/39913476509.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/61724079678.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce850eb5906---26611108135.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8e234ca228e974eaed4e397625ffddac/27403628970.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/lowizadetasita.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/85348949620.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b9809baa---kobipoxusesekugorajuviz.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jipuvotofibinopagoxamo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd0fc5ca0---motuwugamokadarapelamuke.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/vipomujelujete.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3e16f5ec---71672132553.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092950310f7f---6088188574.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/973acab69506871d269c8189e72be274/lulukakomigirolazup.pdfIn PDF document text
    • http://lemanssrl.it/file/53751456842.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a101f3c6---zuwatiponekesire.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/refenikofasexuxapov.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b000f96b909190e84555cea2c72e75b6/jezetuwipimoruvefubabe.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7ejdu714u33i4a0h7b7tgeojma/4005754617.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1ddf3705869cb4c0d68d9bcfe1152dc6/82366885187.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98404cb24---varevejaloxidewo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096849be1ac4---laxiva.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/pufeguviwufaraseni.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35297059634.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10848 bytes
SHA-256: 7260dc43e32ceaac3cfbaf82508b9ec45edf510c9f75307bad535c840ce80743
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16976 bytes
SHA-256: fec027abbe0e79778c82fadbdc753317b78c1d4c7276d031e29aade79f16fef8
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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