Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bdd896be7e2a67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-29 14:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5fbb9e61e737e15638f0a35429159a9 SHA-1: 8bd65042cd54e8689fff503d84da97316b92f77e SHA-256: 41bdd896be7e2a675d0055147a920257e6afe99c371e04820caa5226045bba84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sarljarry.com/userfiles/file/mamikutimifo.pdf In PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/kusesipujosiv.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/feruzemazizorefaw.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/27175167473.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/23588186885.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/03f6bb04f14d261d4c6019f3cc8852b8/sidumukiwuwugonatigupotoj.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/wezuguxekules.pdfIn PDF document text
    • http://raczcsalad.hu/files/65868195608.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/88440608498.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tiwagipolobed.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/kasapufenekufepoluzapuxa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3fr6k9runqat39apairchepft7/87103999951.pdfIn PDF document text
    • http://www.edgartownschool.net/uploads/files/tesamud.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5981c03231a272151a85c0ab59ffd160.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/39271438027.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/wilufotikunenupuvilogot.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/xuwokaxog.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/50887917375.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///38809397168.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/tazodososalazosovaje.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/61076019941.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/gexadaxixezuw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6817479e0---marorogarepopopiriz.pdfIn PDF document text
    • http://cutskytools.com/d/files/71500919300.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210923214258.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/gegegewamuruperetewiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+vs+capcom+infinite+download+apkPDF 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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 20968 bytes
SHA-256: 5941d4d844e7f6fa625a4e71954ed960994acb48424ba0401f45085593fda6ce
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 11020 bytes
SHA-256: 5e8f1f745f1c98b2f7842c04c6f9b27cbaccab98db015563eec29f08b1832372

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