Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec03a3c76829bb4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 14:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdc345a882fb2fa337f1a65b29817c22 SHA-1: ec65e6d7ee500e186bf1be4d29a5cc81c2b4d7e4 SHA-256: 5ec03a3c76829bb4ed2d02e2126219f59288ea3b932d36c007ca86f7cf9a9e49
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs confirm the link farm and compromised hosting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0447fa4e9acaa2552f616687c927fde1/deburezotumilaz.pdf In PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d076361b46---27343508290.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611179d8dce72---ganodejedesavebibiginowo.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/wofufagufi.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/99647573321.pdfIn PDF document text
    • http://jaika.in/images/documents/files/kesegerugurajedej.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/93000424771.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/51566666773.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/76508168840.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0734c1a7f5---totowepipukopoxakole.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160faf35614432---57470838840.pdfIn PDF document text
    • https://kopari.hu/files/file/gogogep.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe2edd239c---69974611607.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/8328f337614357419ac4af98ca8fc556/pakemituw.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebc26cffeb27246f888cf90d62cce329/bilawivelakobi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16095176dd684a---63344744132.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/79411718696.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/33519546402.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac614fdfb97---28538708593.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/85852856432.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0227971a---katiximovutu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/29798840627.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/xotamapemanopumiwaduvab.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/72983200107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=csc+scholarship+study+plan+pdfPDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10832 bytes
SHA-256: c89a3207079fb5cc7176cd2b4647c6542bce7bfcd9e9250cb5318143cba5a131
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 18308 bytes
SHA-256: 24caadbddbddd44edadf0ff3887a7251f2511c17d460e2e2153f6014ac4e9e1c