Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf30b5297f95306…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 13:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df7d573d424cd9bf80c7d0aba1898366 SHA-1: 374db2ee7468e7ba20fc2d7e1b5dea04f76d9654 SHA-256: baf30b5297f9530617fdbc6fc1475ac14a05ae41de06f82e5197c927b1c94b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=maxalgina+xarope+bula+pdf PDF link annotation
    • http://movesearchesuk.com/userfiles/file/bibinupirupimonowifo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/43jk8cgckp9o95q54n9jr3317k/36248043395.pdfIn PDF document text
    • https://akvaguru.hu/user/file/17150101253.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/31654343427.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210903_22398D78A270FFAE.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/26275875443.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dozugazaper.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/65833751231.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/wituro.pdfIn PDF document text
    • https://12shio4.com/contents/files/tidudivu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/notutokukimanijutej.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/49342753082.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/xadusoguwufimekakosax.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vtfhjvt1hj01mdk2pvpi1l5n57/58650010733.pdfIn PDF document text
    • http://labotinnghia.com/img/files/misogipulevanefat.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/87253485374.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/gugobi.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nixusosurerisujemerasafow.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lajemupopigetefeto.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87002eee5---bedudetisetasuwozuba.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/35702670690.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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 18792 bytes
SHA-256: 5d60752bad4310609f3c3f8cb71a1b596f443c6525484b951516b87364c142ce
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10740 bytes
SHA-256: 1fe353907949aae10d670388cdd3fcf9e42b5dbb2ad5c700df923b8130572976
font_02_sfnt_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1