Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8193053cd8c942…

MALICIOUS

PDF

89.3 KB Created: 2021-08-03 21:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ebdfaf022facd195677631348961784 SHA-1: 495bbab3a7a6d1d898414953d07dcb5e42cba248 SHA-256: 8c8193053cd8c9425007993a63512a2fa12b7a1d86922a329f987060925576b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various websites, including those hosted on compromised CMS platforms, suggesting an intent to redirect users to potentially malicious content. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://queure.ru/uplcv?utm_term=what+is+the+value+of+the+bond+angles+in+xef4 PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/51b9751b18df45b3a16e1b2eb95f1058/37607298983.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9a64dc0f195bf35dd0858eff96a5a61c/61029208708.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/nurukegedapowe.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/navedoporafonexakemudiv.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/71e11d203205240738397e14d3fd804c/xugixi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16275705393855.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/52167707216.pdfIn PDF document text
    • http://deltools.com/userfiles/file/pezugadato.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/60323335945.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fekaganafezokekowebabazam.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088470e02512---10519107516.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/bivumesuminuburisosoki.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11fbca49a---geginetonifit.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0s37aot2r3jrstgjpb1nltilp5/44365376671.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/29450981833.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/60341301142.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/98251972919.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/57806046601.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/880bc952adb15e368252f736827fa9e8/susaxogemepasixitodute.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/48835018978.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/tubewivuzafuxi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1d0e712e---16039294708.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3a9f36d5---sevujalijudefodakufomo.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/15228297254.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21326410030.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160787ef5093ba---3282130343.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_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 17796 bytes
SHA-256: 6445159cf1518e763b254603b6d653131fb7b4e518057aa5c57c0999ec0d7ec6
font_02_sfnt_off00013e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 11012 bytes
SHA-256: 9d71839ddeb0cad5af0375143bd72a8b0b6cccbffe51f76ef2a15bef2b3d1f2e

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