Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c07ba9681bf623…

MALICIOUS

PDF

99.0 KB Created: 2021-07-03 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b21d0eba6986010ca4d03d5e4490b10a SHA-1: e8b55d0436302e60bf65a88e6f47f61a6356a6ef SHA-256: c3c07ba9681bf623c46dd3dbda36b2c3f1566c4625ad462fdf12067a605e7d17
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm indicates an effort to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://queure.ru/uplcv?utm_term=campbell+biology+in+focus+pdf+free+download PDF link annotation
    • http://ingenermarket.ru/userfiles/61075732517.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db74ca491b4---pakadez.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/roxinasukizorofalosileled.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/6818fd64d95f5f0150bff5a46441dbab/53652921813.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/299c83b8aa6fa708d294fae08ccac793/nakutozevitalafukuragon.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a233baa4917---56917319541.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/44453712764.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4daa58674---simugaxeruvubudiw.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6309165b4c---59733018749.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090382343a5f---zizitotenaneme.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gositolobipetoxawofigi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d6db229e3---binizutesuzexuniroz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f72b3b5e0---wifatorufisevotaripunulim.pdfIn PDF document text
    • https://grouptm2.com/contents//files/38328693665.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/68981236057.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/81aae2705c348d0e0e50fc325dfdf8c6/73799557246.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1e8df6d---dogabowa.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/rogizogaxono.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/70886107818.pdfIn PDF document text
    • https://whitegold-eg.com/userfiles/file/7334067017.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/novanokofilago.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d518e7019b4---rikexuj.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/48392967705.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_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 11336 bytes
SHA-256: c289bdf8984dd795abc3c0da6a7e4d5ed4d43a2b399026710a72b2aaef0e703c
font_01_sfnt_off00013825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13825 17792 bytes
SHA-256: 72d608ea56007d2d13f851e95ee8cd8b921702e082233cf0ff001d9392b49b15
font_02_sfnt_off000166ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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