Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53dca7bfdd1a94b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 08:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3efbbf4b160b2f9046e122dd6ea198b4 SHA-1: 23a2a66391c816d2b12c46cce8b8e01f5f8fb83f SHA-256: d53dca7bfdd1a94bd7b66de4cd75a81d0a613f5137a1540df7000c15f26e7226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=toshiba+dynabook+r732+manual PDF link annotation
    • http://archidaldegan.eu/userfiles/files/41261418247.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c03302b2302---kopesa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f047df42---xalevukivozutibuxef.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e563de7b1---vumapexipaxumakobu.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/14840508282.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4d2ab45e6ebeda415bc0ffb524f26a56/mederer.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27166749019.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b0ed29e8a01ca99e61e2313d37150611/41402738177.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/mudemebud.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/92605639724.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/15079815474.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/js2kafbe7snhc3tfmceu3e4has/wovujisejug.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/kosore.pdfIn PDF document text
    • http://pololanna.com/user_img/files/punetadosadoja.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/wubuxarireb.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/24521342378.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f04ea085a3d---11016375211.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c725c12346---22026451405.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161164ca215b46---nigipevizisunamuj.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/88203186387.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/verowofebiguj.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/gezamapidifulela.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b66b3e13d3bc7071d90b08bcbede1196/nitigumugavuzofozel.pdfIn PDF document text
    • https://fototipia.hu/files/files/1011869083.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/jepujamibuvujera.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 11036 bytes
SHA-256: 2ad4a33877ac0d07340f5fd4409db0eacfa728074c25d5496122c62f2cb8919a
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 18044 bytes
SHA-256: 31a9c4ad3eec7a976c8831ad48156a72a9d06e14b303fd45b9214bddb4148875
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.