Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec4f35761df6c3…

MALICIOUS

PDF

94.8 KB Created: 2021-09-19 02:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a8c74c8ec8b539c2958c174d7b5f200 SHA-1: d35333b79b3d0a5717cba99867112896cd94a5f5 SHA-256: a4ec4f35761df6c34f7a39e4440379b95ea6e0cdf4eff6dcbc75d9fc726e8375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to download potentially malicious content disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://orig-shop-gsm.ro/ckfinder/userfiles/files/ruparowekakifemazagonixu.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462a749da40---56695468186.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nopado.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210912000302.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/64772565096.pdfIn PDF document text
    • http://ud2-140.com/files/30287753060.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wenonovokemera.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/tategodepeguputapem.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0945166d---395351881.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/48898939078.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/zuzisejizixekizulomit.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142465b6c04b---fatefopojojinidewajis.pdfIn PDF document text
    • http://telecycling.org/files/file/46191174789.pdfIn PDF document text
    • http://getem.eu/files/file/56319545081.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94120dc58---73385040259.pdfIn PDF document text
    • http://schokofontaene.de/idata/64735090323.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a1j9e4g849ccd48kj3fp499u/79536377480.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/29120285990.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/45929430278.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/94499551892.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b6314lqs9g3mj2bfm5omojd7oh/tigan.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/divanak.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/veget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cleo+sa+no+root+apk+downloadPDF 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_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10500 bytes
SHA-256: 0ea95619c43bfaf893308f26b7d33949e59e999aae38fd0044007143adec7dfd
font_01_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 18852 bytes
SHA-256: 43fa5c64ceca7d8b776b3776e3f5374eca1e98e898a8719b621772e3591ff251

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