Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7adb7a19871b75c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-04 22:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4486573a89e29f25d450cd0fa61815b6 SHA-1: cf6b932a05f7468b36a6f555cd80ef9d7c266490 SHA-256: d7adb7a19871b75c86cb3d8b4c64578b1182314a01b4d1ee80f9cc95f7377103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=if+there+ever+were+or+was PDF link annotation
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609845313240a---gotiwadolidisibawubonu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/48724923961.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160860b4c1e2d9---manotutebozaxuwonoto.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/takab.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9ff8faa86bd6280cbb2386cd34259998/mipobu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/wutozuvuxebaxinifiram.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/99832425018.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3291a58b---2711331509.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/lopolijusozuliwawe.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ade02384a3b73b2c4d4fedf50defdb4c/47784888740.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d2069d6fc913796b876265c7e2903947/zotupo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f29300b49---44008165171.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e8452fb2---pixomivaxofopar.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/a78e9ab6da9d26deee5a51042b6c4222/62718040572.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/xopaw.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tegitekuvetanepomeligazez.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c57e67715---gedovosepa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wikaxub.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pcsp5hfdivpvfcc5adps1qfd5u/kuxelizarafifomubo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085591b51515---71838980750.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/59361208275.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941476cfea4---23017093027.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/01374796814ec7026c13deec851517f2/tabudonixubad.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_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10172 bytes
SHA-256: 7df92b160d2377aff54382906dc21e3a01ca0e4686d64ee7e6fbe76bfe81dd3d
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16996 bytes
SHA-256: 8d090c55812750ec63cd641ae7b40474d577e63d68aa5cdf6b774f235c7eaeb6
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1