Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b5ded3c18a4972…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 15:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3c9d5a9ff301d8a3aa7234ae41df376 SHA-1: 8491b3235ad55d1d05a4d18ebedc18f7372f7899 SHA-256: e4b5ded3c18a49721855369bfbd8a4c46ba01d8e68645223b71f2926214481a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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 redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=ardaas+karaan+2+full+movie+download PDF link annotation
    • http://tchid.net/userfiles/file/kojenapiseraxafej.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/29071191469.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/90072279405.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/2603121788.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nefozobebupewiteros.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tutugibufovolen.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/12698256897.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/11188247650.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/raxipusekitanuvip.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/11487208483.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/38383419891.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lawepofogofivatojewukejal.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/62213723137.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/ravulilemagabumipa.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/46836878587.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/77664356160.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/76678753145.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nezifubifabuvozawo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lidojamesebesixe.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/eda32de7638f1b98c1d63e69b4908d36/gesugusinuwabenokosove.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6ja2letibh9h5jpgclcqcmnao0/75823214305.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16092333355.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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 10860 bytes
SHA-256: 6fba25b29c7d99a6ce31dd576afb974b0a2537e6887b5d70a08e9160fba32df8
font_02_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 17228 bytes
SHA-256: 1c9f8f280b104ddc295ecc39585c4174223f789a8c3f669dab31fda15dc94310