Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dc92a7189be977…

MALICIOUS

PDF

150.9 KB Created: 2021-07-02 12:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 77d22547f1d4da7a94efbc647209d584 SHA-1: c11324bcb4b0675d11219760734d6db8da1fa93c SHA-256: 98dc92a7189be9777f3f7e92a544dd95108a29cb7fe531038356f9811ac72c24
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcbfefe00---15001174950.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e8c057277120c9f0eb625c6db1c37f44/14028944961.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/92727772946.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612165240.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kukeruxoponi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9bf6aeef1ed5b580b1be51b7bdf61946/binasodivewojazexotevute.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/rutokulewebutapafuxe.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5c20101a---53127457968.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/43153094880.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/48449848080.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/gaxalidadumidotawujiwixad.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/33173012320.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82483a8836---gawesijowalazumukipumij.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1058ebb7e---68849588717.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9483eb8d---bivax.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cpgm77389k6mmag2igt895npq8/16939294286.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs0ul45t2jtsdecd4rvj835kj5/pavemi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a194f2b713a321760fd59bfe1042dc59/kinoxefifekozotubusodojub.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/donapisadodizalam.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4180572f8---tuxik.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cfbe58aa---23466501929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=equal+employment+opportunity+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20332 19344 bytes
SHA-256: 86fa6f1525fb8068b349e3f1305a0fdbe78a2cfd44e4f6c9be447b294d80f032
font_02_sfnt_off0002341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2341D 10768 bytes
SHA-256: 5eecdddeaf1a1f76f33dbfdad9afba08009eaa589f0eadb1aa7ac7bf23eac595

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