Malicious PDF — malware analysis report

Static analysis result for SHA-256 de45abb05709fa7c…

MALICIOUS

PDF

120.8 KB Created: 2021-09-05 01:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba5bd537f931cf004364cbc1d672cb4c SHA-1: 024ea66ed8e1747168e7be9bdf53becce2dab72d SHA-256: de45abb05709fa7c6213bcfc72fcbc731412827bd04e6d0a81e72a2d84542fb7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.dfdtrading.sk/ckfinder/userfiles/files/suwewokifefaw.pdf In PDF document text
    • https://suacuachuyennghiep.com/uploads/files/zusobajidabotubisudupulap.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/lebejazu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4d92db4a---nepafes.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/8274841275.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gagigitifawiwuselax.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9e2d12db4141c65ad554b3321db1a64a/turazesot.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202108104433_194787104.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tafofarun.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/91958026711.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835d1b5995---12583802828.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/palovobavul.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/duxijoxiwopekuwotirem.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067de67a01---36529842320.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/49914551908.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/20736111991.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e7238c3f---fotod.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3446787d2982a3939b4482549293f699/jijumiwesariseti.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e1a52f6cf37dd675ec81afd335750351/33040339953.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9c08f30---zipule.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/pibagexilirituledibedez.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/sojesabinegasegaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nova+treasures+of+the+earth+worksheetPDF 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_off00017483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C95 18744 bytes
SHA-256: c915fa4900ed8c8cfba627f18c3409ab029e80e65394a0351c884263cbfb22a2
font_02_sfnt_off0001bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD95 10388 bytes
SHA-256: fe365c374eab0b821c2fe923edfc086c871b075f9e16d394e82c6b8bda564599

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