Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f43060ce946a918…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 17:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c10bfc3318f08126dd42de61bb8a60c SHA-1: 303daaa7eb68b66cd1a964878e2581898179491f SHA-256: 2f43060ce946a91822221c00acc24cd3cefc4396f2de7e418024e934f90b7978
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised CMS platforms, designed to act as a link farm. The presence of a 'download button' heuristic further suggests a lure to download malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and heuristics point to a phishing attempt that uses link farms to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d07a4f969---57571312324.pdf In PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/95120667176.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa74913133---zonavuvubibil.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6ao3e2eumrr2eah1a6agbepkj6/bejikuxaxabefejajigobite.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/ximopusogirimasekasasu.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/duzebebapar.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/89958357999.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/35472822027.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/76025209114.pdfIn PDF document text
    • https://tepihtrava.rs/files/2533759232.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/34799466926.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/34525124679.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/vupewamadok.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/dadivesesevusilepogek.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/80379950304.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/galubuwes.pdfIn PDF document text
    • http://synhbio.com/upload/files/sesesaluzevuf.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/6143642259.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/42968454367.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/menutenoxo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/bijilezizisepekekajen.pdfIn PDF document text
    • https://gangnampools.com/contents/files/pasasupetogutuk.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sanapabudigalofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=galaxy+tab+s2+firmwarePDF 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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10752 bytes
SHA-256: 628b4aa6d151e77b2b3b95b245c7fac35a2c082c70529138f1bee80b65c7860f
font_02_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 18908 bytes
SHA-256: a0e02a305296f4274d9270660e250e10cdc763c92dfe57de541616a8daab6081

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