Malicious PDF — malware analysis report

Static analysis result for SHA-256 714089aa542cf52d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 442f69ebb63ed430557fd00e9f24dc6a SHA-1: 2324916d15f9cb780ba1a790f2a21398244c0b57 SHA-256: 714089aa542cf52daa01d47d679b82db946c4595e79b9ae2207bbcdaa9d19785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://gyermekhaz.hu/Content/site_images/files/40288431891.pdf In PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050804381834.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/vilavumewubofisuxudemiju.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/81152881457.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/tepukati.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316e5a02757---31768432743.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/69594270836.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/2817848681.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/ramixutolizewefogo.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/81176729519.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bamegadekurejor.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf235e2ef---gijudufovo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613240576c9ae---tunivewaparutugagawu.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/18415641460.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/51052705251.pdfIn PDF document text
    • http://only-svet.ru/upload/files/21875903897.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303d713924a---32829069036.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2468c1bf---vuvaridosevukokodufilub.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138789db122a---97398303741.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/pijezobudutugibobibonilo.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/mibivobunodubumek.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16137e56e97804---50947970490.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/22405508269.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pazagifasifedizozusome.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/befiw.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/36246334226.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/18524704625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=avengers+endgame+full+onlinePDF 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_off0000be16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE16 19808 bytes
SHA-256: 4789772769a5c011356b48b45801e81d4ee6874b91d8216399b63ddbde2c442d
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10744 bytes
SHA-256: 977b21896b3befee5c7742e30d13454d2726d03a41437401e09a1293e7b735b8

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