Malicious PDF — malware analysis report

Static analysis result for SHA-256 0394b24fbfe2837e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ede18d6b584f0cbbc0636c78584d846 SHA-1: fb58f754049387ffd4e449abc05c4bf73eab3aaf SHA-256: 0394b24fbfe2837ea4b85ebbe421494a95b681d791f172caee2ba02bb68891d8
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those on compromised CMS uploads, suggests an attempt to distribute phishing content or further malware payloads.

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://circolosilverblufitnessclub.eu/userfiles/files/ripijukomatakazewedoboto.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28eec8799f---68833058161.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/82990003011.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e418af6045631334c6a9de15c9c5f440/50636012807.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/31689046665.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vatukotuzobolegavawe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2c2ae7f756a9570b521196f4992a05ec/61278627190.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/49f7b2cd03dba366b37b314502782217/92085792921.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/76315776345.pdfIn PDF document text
    • http://matras-devison.com/upload/file/56926348012.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/39211572343.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/66361978793.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633bf365f6---4201809428.pdfIn PDF document text
    • https://synersys.fr/contenu/file/52347804745.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/74340791397.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/nadurowokewiwezusigomerux.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lamiba.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/21967704941.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/danenobefula.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/wemozexomatafov.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/2373656406.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b0d4c0c17b081b29ecfb360d769abdf7/mediro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=writing+descriptive+text+worksheetsPDF 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_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 10924 bytes
SHA-256: 4c10c8de08b1c463f470baf611fe814cdf1c29018161adc692e7dd2f760a5ff5
font_02_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16744 bytes
SHA-256: 60e8bddcafd2c9ae9565b6b0ee49f6e8de4dcf65e08386d9f2447857696044ba