Malicious PDF — malware analysis report

Static analysis result for SHA-256 67176de8e9fbb414…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 10:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8aff887b905d621c3126f080cf389861 SHA-1: ad68ffcaa85120820b2c5442ebb3b94b778f25cd SHA-256: 67176de8e9fbb41402a5316ae2e341dd3e91dbe919bfdc21d7fa5c328b8507dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the nature of the heuristics indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://ketchas.ru/uplcv?utm_term=b2b+hrs+android+lib+%D1%87%D1%82%D0%BE+%D1%8D%D1%82%D0%BE PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/43691590845.pdfIn PDF document text
    • https://majubesar.net/contents/files/zunumibasagejer.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
    • http://splogservice.ru/content/files/pagorelaweluz.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/5133416861.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/48324460730.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/rawesavaxesa.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/58600173892.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/fosifosumuxodisufunelivif.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/jenepinepuvewu.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/dajowadozosetopovuz.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161442e938071c---miwezujuzi.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/sodaxuxigezopi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2db6b252---kojaxogajotajulobeziwasi.pdfIn PDF document text
    • http://wsm.hk/images/files/gatoxotinufuxuj.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dapapulujevorizafakuwitu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b597d9a12e---fefavibumaxotorinaxe.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8clcbusej1a5pcq4o8k96us521/zunurased.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/83975537111.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zokug.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d690481ec---63312038303.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/99405573691.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 18448 bytes
SHA-256: 8f95a1de523925577156098b9a347bdb8c88c14d2f0b6e453c805cf0d896abaa
font_01_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 10828 bytes
SHA-256: 43e659af13f1b57a34d639edf038b9a4499c3e75718eb016145d2b471dc2769d

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