Malicious PDF — malware analysis report

Static analysis result for SHA-256 7817dd9eab755d89…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05c59a3928cfd1cb53da0f30cc34259e SHA-1: 60bb7fc64ad9aa17ca137855accc0ec210ff8f9f SHA-256: 7817dd9eab755d895424378c894be75fdc843e51445aa46a296f1dd4949a8b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://101-games.ru/images/uploads/files/maxituvejobovujowedexirez.pdf In PDF document text
    • https://autonoleggioassereto.com/file/dazobumo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/34581204883.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/jagivigewatew.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/72021275673.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/delupawa.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/xunofuxozujumefivobetono.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/zagizixawamopofise.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135932febf5a---5516845875.pdfIn PDF document text
    • http://kco.su/userfiles/file/33197870625.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/21767584831.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/78365582820.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/juvepefagapuvit.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/pepabataxivodavez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e07ce9076---98422063769.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/1d1c4f0861fadae65f12cdc40be32f00.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343261dc0c6---juxofepovevevin.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/89bac1c421e76b32400821cf51b30a1f/20887063994.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pidoxudumidamiluduselizo.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/pixudifer.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/71991677760.pdfIn PDF document text
    • https://5uempat.com/contents/files/majurirumiluzadogevator.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/lelutidevorugujebudajojov.pdfIn PDF document text
    • http://usagimatur.com/files/others/87238121105.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/53439365307.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/40266867772.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16110469670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=padmavati+movie+in+tamil+watch+onlinePDF 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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 16100 bytes
SHA-256: 42930193c0052a12cae6c2c22ebdb9211fa936e01a5e4fc4314de1af7be10841
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10520 bytes
SHA-256: 7273c9021aba093eea56e7419e676a441271344e13111eef6b9c6640b9b5f6ee