Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6175d6d962e773…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b85a7ecea06fa9bc7ebc62d55442b5e4 SHA-1: 147a55a0b7c9723cf12ba2599d24c16621b67e7d SHA-256: 9a6175d6d962e773b715e126e89cf8edd237cdc299f0daf6346166df0cead7c7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, characteristic of a link farm used for phishing or distributing further malware. The presence of these links suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://chcial.ru/uplcv?utm_term=honda+vtr+1000+firestorm+manual+cam+chain+tensioners PDF link annotation
    • http://manpukulivermore.com/uploads/files/81119454972.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/18862554289.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/2316248358.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/87352488298.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/memavavizibixemusi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd3d2a655---92115182240.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xoxamidekevizos.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be670735a4b---3915134053.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/59164163368.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5c55ae65525521a4ca99306411cacbd8/xadebesaremawosunete.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kafewigufeganebezalej.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/75532765401.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/43971470017.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/67449053058.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107300232433390.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8bd4fb060045b71849f07a3c24ac8491/63319966805.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/73041156961.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
    • http://agrion.org/upload/fichier/70945565692.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/vedobane.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d03eb2013---49116832192.pdfIn PDF document text
    • https://pellevah.com/upload/files/89203913616.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/85574820830.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tsutg6bkmcuvp2htdq9lf43qu5/66894243801.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/ketowimipad.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/83979986585.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/7068147793.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3f0f9f29f14a3fe71b1fc3eec607e67/22112418891.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_off0000be3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 11072 bytes
SHA-256: 0b99bcf34851991e63c217d9c9c61a60614fb9ca598016d90021734babcde38f
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 15944 bytes
SHA-256: fc8caab0a3f0ba484d3bea12a990afca2b8567f7b9dfe150fdbba69214af49c1