Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521bfb5df42fc0d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 15:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd1c2898e7ff595be13067321536219c SHA-1: 9e2b53292803b43fbf9259f024e48890f4f2033b SHA-256: b521bfb5df42fc0d02aa96967294c7d5fd3731e8d13f46a06c164e2bf8adb796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qnveu8ufhqmk5e19ngggetbtka/pazarevafazunosigizif.pdf In PDF document text
    • http://resortvillairene.it/userfiles/files/45837327781.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608299676a89e---bedipewi.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/lazatidoxosifubul.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/xaniluvope.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dad8lbvcol79dhscfq9btc6hvo/58448191561.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/mujejanexopeja.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kuwemegixafuzes.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/vujegumetuf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e5e8a8a2235cfbae389416f4a5f88e66/wamimaxesomijibarago.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/12407092962.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46fec67c0---25008373039.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lafiroxedaganiwefome.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/wopemanov.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6311bbf4b---5783819925.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/64736572624.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0cdcc6b45---2773815232.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ab13066a---37678565473.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/54756393633.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tnqrb84pektfui62jlt00shs15/joxofavumanu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/apemi034396180vqjvq67n8sp8/35972170659.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/65632437273.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/78136389874.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1bb557d104c8bee34709608c7bc8464d/pijarufinaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cpr+pediatric+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/menupividipakebuxij.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_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 17912 bytes
SHA-256: 356123f96224864a246a408dee833e0b7658c265864e5338dec17ee75176f221
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 10208 bytes
SHA-256: 3310b681b02bdb6785e6a4a3a0ef5768212fb3a25591a7ceeba6bc47782b2647
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1