Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5ff31a3e2a47f0…

MALICIOUS

PDF

82.4 KB Created: 2021-07-01 19:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3574a03b1f8f033ba491f13e1f68c18d SHA-1: 82f1e9d5a0e63d5f75c0e41efd17e1b273b7cded SHA-256: aa5ff31a3e2a47f0c471b1942a0184c8445066b27fb56e40cd42d31cb3a6752d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1848a018---53957275487.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/470b18014d5841393e68647f481b6a85/tupozojovotebar.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e680360209d3c72273de9dc7a0c8af14/77992272320.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/81181623908.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093741cf3015---vilafezoteso.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4a038b144493ddbbec2416d8993229ed/majodiviketuwefuxa.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1abff409f6---gugukipinejibil.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/velobule.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b5facfb4e8f67c5aeecb0e9dafa4ea68/xewitazurosododev.pdfIn PDF document text
    • http://djpress.pl/Image/files/32851124806.pdfIn PDF document text
    • http://i-dron.cz/data/file/wigovimi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/37787098296.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/28809693006.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/18583943312.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0f12b618---kunesuvitat.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cfbe58aa---23466501929.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be69474a992---37353593710.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607023d1785cf---zakijegojogofokusokek.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1476dbfafa811e1bf609711b1de836e5/tisuvo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/26ke6mbu0ea8gc8o2jij7kidov/29994068372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbac158163---mexofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=in+the+tell+tale+heartPDF link annotation
    • 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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 17704 bytes
SHA-256: bd1b53cb753088583b45dd909df8b8b1ff8005b300454b4b882b1402eb5e3325
font_01_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 9776 bytes
SHA-256: 2f1d3020dee61d5215155e2866f0701b2dc5ab7924397985bd1dee61172e19a3
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1