Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3151ee028a7542d…

MALICIOUS

PDF

76.9 KB Created: 2021-08-19 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1927d837e0208515fd2b53151af1120 SHA-1: fe74f0e3d5edad2ed7288eec44f74e44a5b5e4a1 SHA-256: c3151ee028a7542d7dbf55c8d89cd4d5735ff494070fca0cfaa259c4788c049c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of numerous links on disposable or compromised hosting suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6e95892ff---94244981660.pdf In PDF document text
    • https://rachelrom.com/rescontent/file/zemeg.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/50122687647.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/raluzebazota.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/815896a2a72f4a91b3e93b229c3da5ad/23879384015.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/44484095209.pdfIn PDF document text
    • https://inncredel.com/uploads/73489543594.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/22483303979.pdfIn PDF document text
    • http://2-view.org/home/view/public_html/ckfinder/userfiles/files/77504652248.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160775dcf28ecb---ximebep.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/29770417556.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/887d0b4296d7590e8d87973468a4b43a/74133796310.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/27042825595.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b399695d452---sarosopekafogof.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508230058576642.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6579b4ba2d934bfc621edebe27b55f15/sagujuzazujenojojamuta.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rebigemuragijarijexe.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/vogetavotuw.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba9f1df5e9e3cde241b3f1acb255f16/nebukubibijumogi.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/73649765203.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/bofejal.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67924957911.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nibazatasina.pdfIn PDF document text
    • http://benly-carson.com/product/files/34687203085.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nahk5pa6ri67ehdtf25uc0rt7a/62517799776.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/51179481489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ice+age+2+full+movie+in+hindi+dubbed+download+720pPDF 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_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 11336 bytes
SHA-256: 7776e8642b4a1ef1d8cc293de22c9e1a7b5b3ad4dc651c85bb5981b187b6a532
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16756 bytes
SHA-256: b157f84ad84a7b1051ca228691350f2809fd8124fd8ba969dae1827371d44160