Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb387466d7b58b9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cb6b63e1cb4ded7ab99fc0bd3e3bea9 SHA-1: 557699ef584d353c4891cd94e17144fdba42c978 SHA-256: 1bb387466d7b58b933e22813fe2e520e0ccf70210f599828fd6b46e09310d35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=multidimensional+poverty+measurement+%26+analysis+pdf PDF link annotation
    • http://hindel-relax.ch/ckfinder/userfiles/files/foruwuwo.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/57108053853.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/jagarexesadowedadato.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca4881701---jetazafisaninazusunidijig.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/fofafepumarar.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210716222246.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b267e3f8ab---21919871194.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xoleruketilu.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dujejaloxuwemelidekevi.pdfIn PDF document text
    • https://funbugs.ie/files/file/28932260112.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/40722094163.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c201f552cdd---bijofimepaxipune.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab56e65ceef8c5f2a7606561552275dc/bisapopa.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7b8909bb880d9514494248019c8e7bdb/fonegegudab.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/110icqfp5qo3k25dr2asstv5n5/44081151833.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/14233275136.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1e46cb9e---kemanewupasabagaguzi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bitegaxovowifel.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bff81cbfb37---jesupo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8c177f5a4---42252362580.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/gilujelogowifomafogiwinog.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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 10828 bytes
SHA-256: 8b26efa83df31e9bde1d32f8e598ac611e550b7533b3c07af3a880bb43f70281
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 17712 bytes
SHA-256: ef84c3d18373ec13078aef3a814106c529de2f40e075ac1c09152ec8c404226c

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