Malicious PDF — malware analysis report

Static analysis result for SHA-256 747e43dae2ec15f5…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 15:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82d944d6471391548308411e75d31286 SHA-1: 76190fc455ed762a81a14f4c9ba6c442a01c9aa7 SHA-256: 747e43dae2ec15f545327da16a18adc0e005fe7603a6a4eace5bfa0fbae0b886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fifasaxanipukorapipezada.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de991dc4528---muxebaxujeloloj.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/fevojukedokivufig.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0720b4c1---xogovuravenokafelidabix.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/bijaval.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/15215321616.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6mqrit00ufofcdd2vf3iopekin/37148275771.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/56650850059.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed11d4001---64676629265.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5t94d3fmbtr89e7vqijnpbj0l1/vinixeginefivibogamonidaf.pdfIn PDF document text
    • http://klefmarken.se/upload/file/50639481548.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/7526080746.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xelemopixatumifi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/tuvijabajebiw.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210820115256.pdfIn PDF document text
    • https://denimder.org/resimler/files/nedizedaku.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/sujufixulapu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k7r2iemdgaimh8cn36ufg24ogj/79945307589.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78365393837.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b2e653144a68ed8f9d77da543617386e/69172837446.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb8ebbf752---nupowavatuxasekupagewovaf.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b5cb58d13146b5d9f5cfb863390c1fee/mosepopu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/80665666809.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e364eaa31ed---moduzulowibazefenupoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=neurofibromatosis+case+report+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_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 18748 bytes
SHA-256: 68b84f4750593eb7ac5eefc9f5f184ff17599f1a5b3385a4c21dd12575f2c7a5
font_01_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10848 bytes
SHA-256: 26f8c0311eca03b2b8a60a8ccc616addaf9161516e8d7facca26777b3025b1c4
font_02_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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