Malicious PDF — malware analysis report

Static analysis result for SHA-256 017859fc994e75a7…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 15:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a80c402acbeaf5f5cc64fdd2be1fddd SHA-1: b209f56e807ce8fae79b9c2a95415ffb883b61d2 SHA-256: 017859fc994e75a7de1a76ae8fdcb5d311e9e28836fd709d226877e13dc32b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm or SEO poisoning attack. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://korovin.org/site/img_ufiles/tezenazozeton.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92e005d58---91035818711.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/benajexa.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/lijirenogopewenodiduz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd564fcf769---dogewatusagewilid.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/24091759152.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00b889a29---lidarokuwipazukovu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0563dbb32---bidepujosatog.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/gosovemeno.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a96c071499---vofogojoludutujedava.pdfIn PDF document text
    • http://bienbao.net/uploads/files/jifogoko.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160762974baf5b---vidatugimurinonunixixitob.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/liwowevenapojevinupipiri.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/nuvedet.pdfIn PDF document text
    • https://dm288.rs/slicice/file/46659087231.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/bubazima.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609437b908ad0---zapeli.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/74109906127.pdfIn PDF document text
    • http://tecnicadovolante.com/images/file/xovovezudatisujufetuwel.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/232aff6790303a47cdd8de77e84d1c2e/nenagofomitudajozade.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/15874783413.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/80234362075.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/87307462550.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6bdb2217---38992430845.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fubupitimefiduxopukiduwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=candidiase+genital+masculina+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f8f3042d---tegiwizetuxelakeduzewut.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_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10872 bytes
SHA-256: a8feb5063543c19181fca65bf27f951da46b091a5a6f0e2a09f5a3df2f78959a
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 18884 bytes
SHA-256: 8f580da50cfae30d244bc678b938215994936107d761c04ff22198f6cdf9bf53
font_02_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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