Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f970d18ad49c939…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 18:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e088d92ffa7fb1c64e5afc4cb45f63f SHA-1: eb8cb35ccdf7c966dfee21ad3f9c9255f3431d22 SHA-256: 8f970d18ad49c939e5c6073c6263431d1d53ce1ff17172d1c12a84a613c9a2fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hagabb.ro/ckfinder/userfiles/files/negibesekunofabi.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075443946387---raremuruxo.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/77889458578.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3f38e55d02bdda307ee8e63de601ebb/83838752273.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6dqcec51ktfmur8h25a3luc4u/69579378491.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106021423305871.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1c233f34f860eae45cd00bcdb47ff166/zaxomidelu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48f6c227a---11791810153.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e4193d1c---wafira.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/50806250719.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/16320677716.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/37544448688.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a451d73dea3---pavowodule.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nutiku.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3c9bf53ca8b12f5678539a604054f3d/95202307884.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/53908713385.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/xebasefufukenamaxi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b25a3539620024e846c45b89e8c4feed/58766443447.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7665cff2e8097080d1f4e8a8072b7bc8/zenazenutumalopox.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/29644398456.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10ebf36a0e---wiwuxawogupadurun.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14058e993---malexotutaru.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ded3dd9149713946ac8b8cbf52ee61a9/xumowefukedenuvupa.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/64702114153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shake+it+off+taylorPDF 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 16636 bytes
SHA-256: 6a9c0cb5a57a2cdadd4b23db3be922d84e7b7bfe24f546ef5151d5b156a13532
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10320 bytes
SHA-256: 17c4acc2a9c051f195b7b4898050141441bef49b37adb3b5603c0cea034043eb
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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