Malicious PDF — malware analysis report

Static analysis result for SHA-256 14357cade2b8bbfd…

MALICIOUS

PDF

69.0 KB Created: 2021-09-06 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c760a0a19c90ca865b86b7ee919e0419 SHA-1: df8315b1f5b6d521996b7fe58d1113c8fbab5036 SHA-256: 14357cade2b8bbfdf0eb37cbed139aa0d71ed4ac197c6cfbd03d0e69d70f0658
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, making the primary attack pattern the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e028895fa---mixupugaxisidapo.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/bifunezuzebusoj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5143d64b5---kobupubivino.pdfIn PDF document text
    • http://consade.com/userfiles/file/84948193016.pdfIn PDF document text
    • http://konberdbio.com/upload/files/jalodusurawawekukepenutur.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/vuzaxebupebi.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/76847086361.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/83864497696.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/33666837960.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33401017916.pdfIn PDF document text
    • http://findusafranchise.com/files/files/20999207332.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/numep.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/33750282379.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/rimupitebususuma.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/liwekovuke.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/xupajanigurip.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79355e646---tuxivepizatur.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2te582m901bfl0c65d0mtaiv0c/65681029445.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed100936c52---vegagozeti.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbc3b16ea---katabexesowofezerav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=abstract+data+types+in+java+pdfPDF 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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 15128 bytes
SHA-256: 63669f6bce192b748f2a4d6652580a512a59e5111f4014fdde67be530e4be6c8
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10880 bytes
SHA-256: bf314fe553c8d97c0fce0081587327fcd3bf37da8c06b0161e0a3b33095fb12f