Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b3d119ecfd0ad6…

MALICIOUS

PDF

84.0 KB Created: 2021-08-24 18:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0851d85807cd77cfb2575541dea5dcc SHA-1: 4fb745df0bc6829f289db321ce283d7d6d621705 SHA-256: 28b3d119ecfd0ad64779b5c95c213759b8c4f51f16746a152f53c0c9f6c43029
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting and compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://robertbah.si/files/file/fivupali.pdf In PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/venijinipapekinemoda.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/80878322980.pdfIn PDF document text
    • http://belovosushi.ru/files/37881161296.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/74bc9090981d2501425e874ce3e8d557/14830281914.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/32366783470.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/rosoxokevutijekoveso.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/35389254909.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c65944233---59537347672.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/13/file/20210513_042314_154.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/48189603006.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcaa2595a6---jefubukubara.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba04aa30eb---kuwuwulirinokulewevaxi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/somezevoxawudakemelen.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc76b5890---74236279965.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b635416627c6f42277e42445e3b392e7/44716022690.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/zasekijotogoxefulivigafu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c45cc7ed---zarixe.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/dilujegiwor.pdfIn PDF document text
    • https://keongracun.org/contents//files/sodif.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ii72kj0qjt9au5p0pti7bhstt9/73465466482.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8706a79c7---94198329772.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099226d77076---62193622750.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba81f27c2f---romelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tuning+car+games+pcPDF 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 18856 bytes
SHA-256: 08703afda6b02e0eed1d26ef4fd53d945c2ed5fe97bd5a20782ccd84afc2f3bd
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10516 bytes
SHA-256: a7f876acaabeab697e69b40545084f0ccd4cd43265701cc419e2d7e649502619