Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0f09aec506303…

MALICIOUS

PDF

110.7 KB Created: 2021-06-29 14:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ec8f1c3ad1def442990ea9121b1eb07 SHA-1: 4a2dee5ec254333f5a93e076b1e64ad79afa24ae SHA-256: 8ed0f09aec50630337e9d3003a8ffb7c9f7e1ade9a8c50fcbb99ee540ef976e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a multi-stage attack. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://krisoc.ru/uplcv?utm_term=pgp+and+gpg
    • http://nedirajtebosnu.net/userfiles/file/15583023462.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4c43888142b0199356557a4e21e2f432/robubokiwujubigek.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54975eee6---52104177447.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/l71t7451eo7cb7am654sbjtf71/32828406660.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c8d27dbd5fa3a87cb7e966a157b9807c/guzilumekejax.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609043320ee7e---guwerifi.pdf
    • http://www.medicellbank.com/userfiles/files/73856068869.pdf
    • http://fogathajtohirek.hu/fckfiles/file/83058460436.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/86ac545600c29061ccabfb17b8389ae1/salopuxuvekafevoz.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084b6570af---21431876851.pdf
    • https://marigabung.com/contents//files/lamib.pdf
    • http://vamaconsulting.sk/userfiles/file/10110415081.pdf
    • https://rent-1.es/ckfinder/userfiles/files/60200190723.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816922334f9---xurerejipawudala.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564cf6883f---19774214795.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553787c489---guwoborusarenaxutixu.pdf
    • https://elnativocoffee.com/silver/upload/files/16024760974.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080caa961bcc---96542919371.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nelejulowavi.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/oom0b3fabc36m0b8d9d3b3e9r3/14782972217.pdf
    • https://baxsporthorses.com/userfiles/file/84234661260.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2137d9e6---xufotez.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/forifakavufonatapoji.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/menikejidelaj.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/efc42b9093c5a802ec470d17a7dd9ab7/rimesa.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/gitalobezuzewatosu.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/naxuvefezamegas.pdf
    • http://haiphongcontest.com/images/files/47924961457.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e3a.bin
5e280c242b2b90fce109f8b13b30cce43b14f878ddc10b98698be43f3cc6376b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 18764 bytes
font_01_sfnt_off00018052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18052 16792 bytes
font_02_sfnt_off00019868.bin
81f791bd6660eb50495906018dfc99009c25b1696d595b027f1507e8cc07ee09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19868 9812 bytes

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