Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2055289f7d3a9c3…

MALICIOUS

PDF

94.9 KB Created: 2021-08-13 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 680f653f337e1559a8bb402683a772f0 SHA-1: 4b397cbd3127fd9b1a7c7cdb6c181a941fb8f021 SHA-256: f2055289f7d3a9c31787a5df485a61b038c5a145e964f164bcde9397ae0127c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, many of which appear to be WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f32bd83766---9590156824.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/das5seo6lhnjkre29ko728dft1/biwalixaxarukomazomeso.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/pawakovetuziwopopupapu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rl33nqn18f2t6v9g6rrmctdme0/biwiz.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/23695279073.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kamufarijunujuxesobibaji.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210614125046.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/penulufuludalasamadem.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kalefufixemanube.pdfIn PDF document text
    • http://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/duxituxog.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59d095e3c---gixefemokoxesusefifiza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4144641---fasonemaneriwod.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071925420840---logokuloredilakafonew.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d339045b2---78257871932.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hslibggtg3s15krdlqrbba4aja/tisewonoxenezewakasi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941542f0d96.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/36497010256.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/71257867365.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/54552385596.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/61009412233.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/wogobudesanog.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884a48e1f48---situf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e701477d2---wusimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=symbiote+spider+man+alien+reality+black+catPDF 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_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 18624 bytes
SHA-256: 43090aea87a4f2709121f1d306a85eeff8de0c83145595ec7412a18a940941ce
font_01_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11096 bytes
SHA-256: 9c6b3c4c4185a9d929acd0ea24192f8351348d0424cc795036eab1e6b1fa69ac
font_02_sfnt_off00015549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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