Malicious PDF — malware analysis report

Static analysis result for SHA-256 89737deccb4d47fa…

MALICIOUS

PDF

86.6 KB Created: 2021-08-10 03:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 223ef97e4a1ae0e776e3e875e3e6d755 SHA-1: 2342de623ae3c01db769e24d8e9681c38ace1d0d SHA-256: 89737deccb4d47fae1b476370013db5b49c1027134249e9fb0d7f50c6f94147d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=selfie+song+download+by+gurshabad PDF link annotation
    • https://summit-christian-academy.org/scauserfiles/files/74703525903.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/92185393954.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/u1knjs9mr1u1e6ojlbmeo7p3of/99936323184.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4d07a81f697c01cf83b59ad41262b009/68115064153.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f723f5cb9af096a080af78cc9a7ee511/monudenanopez.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160efef2f3e862---69220953244.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/8584038885.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dc6f54243808d992d24fc35c1fd0b3f0/bitojimokezixinurifoxemu.pdfIn PDF document text
    • http://ancheng-medical.com//uploadfile/files/pesifokemeduwize.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/22274912457.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/20364754223.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/bonoketefoxudopamapaxupu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/3dhadr2ifbd11e1ea9fkt2b4r0/48940146990.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c531c955bbb---tomijeneji.pdfIn PDF document text
    • http://promador.pl/userfiles/file/fakigamowajub.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/26038199556.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/8872357894.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/neligab.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b0166c4d924288cd04814ec5215b93b/fowirijixalu.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/31776576709.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/13843780737.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15596247e9---2196645316.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0558c666fcc3bbf09aba071978f11bf/83442927140.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/41d248d3137ec87e36e5d6c6b630f309/95146360094.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 17388 bytes
SHA-256: a9f5e280bf9e36821c562e60baf059b7b672085a6be374a498ad0c173164b949
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 11048 bytes
SHA-256: b5c8f96f558a696057044986e87ea20d36eb994bf460c98b7897d770cd25d4ad