Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9eb45f2a2e17c8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 14:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6392d1238907f27f80209fffd72228c3 SHA-1: a90a8ffb0ea0c77d6d28c9d55cfbde60b994eef3 SHA-256: bb9eb45f2a2e17c8ba895ccc1f04aee97ffed608c6700ec0afc921adbd2c6de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users into clicking malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a52d560d---15820264540.pdf In PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/75944481473.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/97332750437.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/rulonilijoxu.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zituzugolawelaganenevos.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609273ff24a5b---puxituwuludab.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/zixozadesasuvuf.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/32baa1b6c6b78e8fc3dfaec454db7fb2/vovesizurudonumitu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a52a4de55---31898342764.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a69deb6d7717e90122fb11cdabdfdff6/22166023507.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cab4aa71---pudijiwanixenosati.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb476433c9---lorirorevapoxepigiveduju.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb7d2c9fd---58854446770.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5adf85087485f612a736a9d9e6da4565/tipipobutunetalafuluw.pdfIn PDF document text
    • http://expresskaliski.info/file/muwopodebusewimatoz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65685714863.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/rigavakupogebefini.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vifuvegugogid.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907a501368c---lipinolovukufadaga.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasijudoresaxuwuli.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/34383221636.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161002b2066c59---75117735571.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e8c731c6---72031080538.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/joxesiga.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/kavun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tabla+de+verbos+regulares+e+irregulares+en+espa%C3%B1ol+pdfPDF 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_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 19052 bytes
SHA-256: 1854f1276df08efb0dda032435a75031a49bed989b09542aa3cda0f44295a512
font_01_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 11048 bytes
SHA-256: d92f071485287a26aea5787e90f307f6c2755bfe20c1447c4133d3b56701bda6
font_02_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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