Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3c632c3caec1dc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 09:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3893348a4669dfbdfef33d3b583af831 SHA-1: 852d7ed2df7b5cebaea5804fcc773671b46b6152 SHA-256: 9b3c632c3caec1dc5dbcbd50d572892820c93506b7832a84f487a1f4d8ddf0b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://oniceh.ru/uplcv?utm_term=paratracheal+adenopathy+meaning PDF link annotation
    • http://mutamobilya.com/images_upload/files/50492561953.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/jetonilozo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/44577370130.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/xatevo.pdfIn PDF document text
    • http://flexa.cz/docs/file/38104702759.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f666076fd2---24463610524.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab95bf0e19f---93092759495.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/didagu.pdfIn PDF document text
    • http://coachhouse.info/assets/file/59734876665.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/vodisakafemejetaxawu.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/tigedogakagasotovozujavir.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/27007511171.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e15d7fe8f---6975245608.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/30a6934879ed43904e9147af05ad0e36/kagibudu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/31cd65a93cc26557b5078018d596643e/91373311728.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f0b8b70d0fcae06f9e5829608b169fb2/bagumuwuvub.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/nunozalekivewizopixiwepe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/25b0e1706dde6d652322f60b86d5bcc1/82350091576.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/50839544495.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/47524371192.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/mevozenexuwixupited.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7fa3e2f47d69814f26a08ab319ed9e69/24579845645.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b8724e262---dujijomifukirexusiwavu.pdfIn PDF document text
    • http://didopack.com/files/rubojosojijo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd11af57a---34492466894.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a7cb6b8ac3f1c50392629cdfb047fe2/46811590441.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/kenoramaxipapubojow.pdfIn PDF document text
    • http://posuni.com/userfiles/file/45381629591.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_off0000bd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD39 14972 bytes
SHA-256: b42fbb32c49d7fdb8b18109ad4dac38fdb4b7d53592a4db0ec32fcbade60e707
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10908 bytes
SHA-256: 1d936644cf0b50f220a256002262d053ab1b5eb7ad072fad4a24b94ad02d6298
font_02_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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