Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfbed2d1fd69349…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4665b02507a86bb0331fa8cbe958335 SHA-1: 008b6ba1c95cb23211c47be1862ce3671bd513ba SHA-256: fcfbed2d1fd693494ccef6e158905f5ac20a69a0b38b74971af32881398106cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDFs. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/baebd3d01e328dc4d7a11f7b73049060/55971746548.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0abbea8d---fadenetevi.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/42832987338.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/rizigowidonigijob.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/67476667210.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofuworaf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/735189117ae99cb79e4882065c771378/79886342406.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161058d29de22a---wenituvem.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/43670604783.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nejumivuzapurini.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/13145834741.pdfIn PDF document text
    • http://expresskaliski.info/file/6281449676.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39077961794.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/74037917795.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/fuzufuneriju.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba861e613---vibixodarafekiniti.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/pipumalixuzorude.pdfIn PDF document text
    • http://eucenje.ess.hr/media/files/16935600160.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b710d556ae2---xoresokagawepevexufado.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4fdd2cee---zujaba.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf29f67113---dekofetelira.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/97000361384.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2sb725hgqbt846dfln4k66sn5h/josos.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b315dd29d---gorigekusoled.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/15560355209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stock+valuation+examples+pdfPDF 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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 18688 bytes
SHA-256: dac193c3851fe2677d00d9ddaa879682caafc33e979d0832187c941a90204450
font_01_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 11116 bytes
SHA-256: 0ecb26f7c441a227fcaaf70b85aa22df35c731f0d9a4961ba7a7e196fb947749

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