Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e782c231216ebde…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ad90d34382d0357b3a08e6af4a6d1b3 SHA-1: c98f1110f7e1ee5ca33fe97505ea5bbf024e2aa8 SHA-256: 4e782c231216ebde6d152fc4a9eea0583cd8add064dd8f62a0b43390c02c9966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.cavice.fi/tiedostot/files/2868806500.pdf In PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/49141875525.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dikasivojugomebelot.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/mowuvu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/runagakekituwikomivita.pdfIn PDF document text
    • http://koddous.com/userfiles/file/55994469963.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408fca0689a---boxosavalib.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/fesizenugirosejojuvowil.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/fulugugirabeduzof.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/muzuki.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614073886bc6f---vefutokokokebinapup.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/tasufarexevonazapavi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bakujekasuzi.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/59737101418.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/74635676854.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/nosatijazokejafenebuko.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/memelomafatutobowawo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/37975341983.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4251c213---48497268021.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/25ea7fc358e9e1213b5517ccf10470af/sotemelekuzubuzetoje.pdfIn PDF document text
    • https://digireg.it/upload/furasopiwevuletot.pdfIn PDF document text
    • http://harlit.com/upfiles/file/12905433635In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=house+md+pilot+scriptPDF 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 18168 bytes
SHA-256: 23c6b6c18b621ab9a1dddeb5ac492e06b257ad52f2385dbaffe92fd1eb8044b2
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10500 bytes
SHA-256: 59b3880cd1a24fba737b7125a74eab0eb08b5850f7629d4d2c90ea10c37d42ba
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1