Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a9d26b76097660…

MALICIOUS

PDF

87.0 KB Created: 2021-08-16 12:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6656128de64fa53ad2bf9d09eb988ede SHA-1: 09425fdad328991dd8e37ead5794d233648b99a4 SHA-256: f7a9d26b760976609ecdc5ebc6234f865714e3fb9754dd20656461dede97637d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.emailposte.com/pictures/jejirabuvuwefit.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/178e9a06e46b2cc8d91a3758638ceb08/joziso.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nutilulamexiso.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/73597394041.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/sejafekowo.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62058576720.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd40de1f50---kerobus.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/acd5f62db74b75610d0b777c5b0cd3b5/fobogedapaxawaludutuvuv.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc6b0c59ed---sizivofijidenaz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabb6ba52b---60048867059.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/furapupedaw.pdfIn PDF document text
    • https://rajaunited.com/contents//files/visisobavin.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/nipawevogilukugo.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/76027654759.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bncktml7ivh9se7s50c77d214j/wekezuzilela.pdfIn PDF document text
    • http://info56.ru/userfiles/file/valeru.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/39681934444.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa7d18835---93193895816.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10e5ad3548c5af9dd7374b2ac1ac6e17/44770468686.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856cb40ac7---58903429209.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f5ae22fe---tibigakosa.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/78615844956.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/juxomeroponut.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c1550df4---37561471840.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zobates.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=phonics%2Fspelling+grade+5+unit+2+week+2+answer+keyPDF 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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17092 bytes
SHA-256: 8f34c8c22df27661ce368dd6560105f2233dc4c27acc9aefcb177dbc33082b81
font_01_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 11476 bytes
SHA-256: e6a711880066646e16264f8b58565e3d827e7afa135ac3fc23f57276fcbb2d58

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