Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c3c684764741e1…

MALICIOUS

PDF

78.6 KB Created: 2021-07-05 21:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17700c235431f0203fc1bcb3ad87bd72 SHA-1: 756af26b84b9babb8624746ebdf0920e412af25d SHA-256: 80c3c684764741e11843705376590ee2473baa6e5205ab62e30215a1fdaa674f
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 WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=celine+dion+that%27s+the+way+it+is+download+mp3 PDF link annotation
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb9c0c9f8e20b7932c8bcc3daa354fba/vavaresujomomomunuku.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d48329157---sonotuvewof.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/genosuguzetavera.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/57553472761.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/361c3bcd0376953a3bf603245ba6e50b/94640894703.pdfIn PDF document text
    • http://tfforming.ru/d/files/botodojegefiket.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/namipitupomumotobitad.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b05aa6867c3a8c7558ab533f3cc796aa/73911654406.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e1373325bf6cfb9a155b5beb61af7a6e/kolorejiwomesuludizives.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfb6a1313---nubefoxe.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/firabif.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zepawagorufovifexox.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/ropufo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75b2aa9d1---37340721238.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ae2376030---57502780123.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/27759567764.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52ceade7e---55656969656.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/or770c38s05oqh11ist95qopdp/pevezulawepupofiniluv.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/zekamo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/19k9qsjpel2ik0o50f2l5i3se3/gozalarepunuwuneserusapuf.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6009f3d7ca---muropupiremevemarir.pdfIn PDF document text
    • http://domainecomps.com/documents/files/bimidudidemujobujumaxova.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db50025351---96165556352.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9e729354---87132736879.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16094597641736---xowifedafowasiwojitu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6d79637c---novevupuk.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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 17412 bytes
SHA-256: 2b325fc1e65b6b15fc828ce1538c42619522fd0ef98866e6d533320d6c4f8430
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10992 bytes
SHA-256: 9e9fdabe4b0411aa83fd2ca703ff02ea9a9171e69b1711baf5059711bfa8f6eb