Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a24795c037bd2…

MALICIOUS

PDF

89.2 KB Created: 2021-09-14 11:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42ad1f5959b30d03dedde4f126eae76a SHA-1: a4d3c1127eb0f4f4197da43823a4f4f5ab3153d4 SHA-256: d42a24795c037bd206cc7c270dd9b3f2369923e9ad74beb84298f248a3ce7c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to compromised websites, including a link farm hosted on disposable domains and a WordPress upload storage. The PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f038d433---74893628052.pdf In PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/fefanidojojigewa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/raramokot.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xedopefewisibaze.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/pugamazafitilunuwadetek.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nisemagifesozoxadi.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/10513299216.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/58175743650.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/mevugosigegomo.pdfIn PDF document text
    • https://suncables.co/images/file/77779049663.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/zelaxapokovu.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xatisukufaselezaleruz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5f73de90---piwumabuxotefosigitu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/29266932889.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a897c9b0---vogorarapowolokubisija.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/38595079754.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/faxotijutalunofozuvaruban.pdfIn PDF document text
    • https://people11people.com/uploads/File/gofavexodiroxawogu.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/dudubujufutoxul.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090202112073499.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wewutalanamomar.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/75811138857.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/dunanafosavapomudarazip.pdfIn PDF document text
    • http://boldogelet.hu/media/kemun.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/00a4d1f550ef1c83279e8dc17de1518f/62488177928.pdfIn PDF document text
    • https://seikai.jp/free_images/files/64159158769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+online+devdas+full+moviePDF 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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 10800 bytes
SHA-256: 0521959bb49fe681419d4e74410c71bca596d4080347bc8fefbb16ada808f3c6
font_02_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 17520 bytes
SHA-256: 283e6a0c4e0625d74f5a3c1f640a78235497745190b382d474e80262b0ec5830