Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cb7b7e9d3720a6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 06:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 593c0389d9d9e1d6c22ec64c5adf6be6 SHA-1: 9a9cd1edd5dccb6e78af794f373a91158c11117d SHA-256: b9cb7b7e9d3720a63f6ae00a0086f3a2f09b6be18aa7fa3cd4f0b182982d0088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/56459183241.pdf In PDF document text
    • https://lecachet.fr/docs/files/keboruxujofajat.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e8377536---7162885376.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0468cbc4dc90bff71c8c4a43119190a5/fatafu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f819e1ae---11068079491.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/wolapedikeverulufe.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/pepibexipobosunenoritugo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/jozuvokubutuzamakifow.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67e94d7a9---ladidelamepuranuboxam.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dibasisogitiguf.pdfIn PDF document text
    • https://arerp.kr/data/file///45871329923.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974d8001776---16058226666.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1f7ce5ee---puzinipukufivi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d62359961c262babeefe47146873e2bb/5631592698.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/rawurovebukalutorozusazu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bk393cigfjubo8r9c8qbe6ed4b/xofogabexofopukunep.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca99138a2c---63187619988.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f0a2c4ed3f6d73fcd6a75737288dfe54/88443648547.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/biv55hson5qp0eafuosj6f313r/sikunabavadibivivaxunilak.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/34611120620.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/wazinivosuv.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/86001046729.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/fabubuxogetagad.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/63744755699.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5740f5fff80e6c85af8eb20d43de5ca8/95159523641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=yts+movie+browser+free+downloadPDF 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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10792 bytes
SHA-256: bbceb4e324ac9eb5f88d3aea41510b98f6683a4663cbfc657e51cdeb22acb129
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 18752 bytes
SHA-256: 542f3b1f1942053970f9ed8a81c8fad7a3aaec9168baf1c4385932ce6e3abcf5
font_02_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1