Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c55d459e18f5285…

MALICIOUS

PDF

103.0 KB Created: 2021-07-05 15:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 17a436dbde1a1509eb16ddb0c86a395c SHA-1: 315a2bdbb083284e289585e6cb9c1a2faaf59341 SHA-256: 7c55d459e18f5285a867f0604871e02477c1cef87b17856735499bb3ac1e1ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many of which point to other PDF files hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple links to potentially malicious content suggests a link farm designed to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://pinturasoltra.com/images/slider/files/polefazaxejapesiwaler.pdf In PDF document text
    • http://aylincinarli.com/fckfiles/file/gepafepabesalidu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/08c8a51fd10cdfc7175b517edd8b4314/pigibena.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c7211701faa---xogumotigoza.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc5cbffa---10247217899.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bd5921ef4863a1bb674cd284b82a577a/63474735598.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/7370772635.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nj5o5t328limbs4amklmhj7e21/56376374997.pdfIn PDF document text
    • http://huntland.hu/upload/file/tasomi.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/zefeba.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/de9f120f93d6624626bc3f76b5b7723e/70879009616.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f29eae01c---biliravoxadevesezunil.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/16261065103.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zawokidomel.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6767e3bb---gekufupumuzagawowawevat.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/wokuleju.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2441883d08---jajujomed.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fipikamuwe.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/19872274818.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/vavatamiwodisawip.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/wavogabe.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad486d693c9---nodobewerikawesixonafa.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/39424011031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=partitioning+a+directed+line+segment+in+the+coordinate+planePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 10964 bytes
SHA-256: 35f7f4cb9be6587781aecf6c2ff05955edb92418c9678abb3d3abee1ba179a54
font_02_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 18976 bytes
SHA-256: 2ac1b1e5d025aaa4e1ae51b2bb693c6e239dffd5a61e59d37198dccca876671d
font_03_sfnt_off0001783a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783A 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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