Malicious PDF — malware analysis report

Static analysis result for SHA-256 d759f2ec1460070f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89ccbd676a0d859dab4d21059c3c8c7b SHA-1: c9f1839981b80c97dbf641a6ef4dda5b015087fd SHA-256: d759f2ec1460070f6f2137ec9ecda704836a049863fb320b6a85ef4e8d99d4bf
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=acromegaly+guidelines+pdf PDF link annotation
    • http://abwessex.com/uploads/files/giliwijoxo.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/14656804394.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xuzasiwivafisowumepegis.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdfe1f164---boporubigu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a20e0cc0c---zofaxematesakajeze.pdfIn PDF document text
    • http://apcmagon.com/userfiles/22890725923.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/lemapafip.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/61263686575.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b07c12d---teguzu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092610ea4c67---86011663020.pdfIn PDF document text
    • https://chp-travel.ir/data/file/pomibejetebupom.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/13779748469.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/46479751767.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/65f3170de41b83066591951f88b0c77d/66313479359.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a6b7269---64156846458.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/46905212865.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/zebewanoxoruvexaxexizup.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/78b8586339008c5893bf76315a68c043/80470753400.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7e4df67---74725146180.pdfIn PDF document text
    • http://jar-ted.pl/file/92851997371.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d49b65f8---52446604748.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/27784298674.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/xosomisolekejat.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/mizamapu.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/kujetusirepelivij.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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 15660 bytes
SHA-256: 0e30b10f2bbb3b44e1ddc67b9b81e7f24f8b9b11d10c93e0b8ee7e2da01f13e5
font_01_sfnt_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 11060 bytes
SHA-256: f8f66811ced96eb218fe005eecdc5fc87c4430108dfe37de26f76a73b5e56e1e
font_02_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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