Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3bd7fcac5921c5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16012af369b580e2e1bd7ca80372ea16 SHA-1: 9007d1e36d22c172dbb929b3a43b7a008f1ef6ef SHA-256: ca3bd7fcac5921c5ab8a72c8e56bb203368906dc794d7db2571d227febe3b372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vektor28.ru/userfiles/file/58234251295.pdf In PDF document text
    • https://keluargamimpi2.com/contents/files/popetebu.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/52245360610.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/76531586780.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86840428027.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/fatofufebamaj.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/rezenubi.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/79433569247.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/68ccab0c55eff0ff0e882325e3032fe7/89638208770.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/29079333762.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1884660c78b0dd22985deae963d62538/53420679921.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/xixuwilevadi.pdfIn PDF document text
    • https://rjpexport.com/files/fivesikelan.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/24431110174.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071651308264.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/povikapepepikitategej.pdfIn PDF document text
    • http://techbis.pl/files/file/lagulanubi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99c512c53---21983599512.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/godifiredeke.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelenobovonez.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/veluzugatojis.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/ximiponanapux.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/14612639922.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/sesoxotajorakinezuwibijov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=game+turbo+redmi+note+8+pro+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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10916 bytes
SHA-256: 60e2f04669e1193c8dabc15edec57e32eea3788a9e612fa6f9e8538f2084f2f6
font_02_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 18320 bytes
SHA-256: b917da19d1c55bdc5d4d0fb9a56e379c5a03f7192b7b930d83afe160503c664f