Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16c619053055014…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 16:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d95f05f7290f2c7b68c13f702634e841 SHA-1: be4dfc54c07581793de6be1be8d03833dfef7071 SHA-256: c16c619053055014f1b86b10b51a3dfb3041871906008aa8b3eb3ce23235274d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.advokat.com/app/webroot/img/fck/file/wezovufifadevogamimi.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae913b776d---33463412406.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nogegapeleletofu.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/43011881397.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5694a736---nidawatujukused.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732b149cc3---sozatot.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/21870025668.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/veluteza.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c7dc5a49---nisiragiw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef61c641a---53072000295.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/72134423656.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/46344868242.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371cc7cede---zatizevijewapu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b029a7a1bcfdb10e2da1e0db82625019/vilomivi.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/92929649673.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/kisusexoz.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/wirivemiwukibovazin.pdfIn PDF document text
    • http://placc.info/up_image/47249014924.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8b798c5266d37d71d3624e97971b34c7/monuxopus.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e1e818e0---86405786307.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/puzopagewuve.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9652f0b7f---xidaxibaxeragox.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/wizisujizuvuxaligofisuf.pdfIn PDF document text
    • http://www.pvvc.cz/files/kobafeleguviwo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac661784646---60211121627.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4a52eb367e4dd2b1c6adf6c20fe3d2fb/14431090450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=monatomic+ions+worksheet+answer+keyPDF 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_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10732 bytes
SHA-256: 3957587b2dde2af6159221ce8af65cfe219901a39781874311079e0f16f58a0b
font_01_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 18264 bytes
SHA-256: 16dec71625ec9a5eaa2fdd6ceaa3501fccb4f194d81af8e3463979c62e9fb7d0