Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4a8d5e3a73fa99…

MALICIOUS

PDF

104.1 KB Created: 2021-08-12 15:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0ed9419653706d1c481b965740779a0 SHA-1: 1de53b892d25e7090dabde9769b222a092408e41 SHA-256: 2d4a8d5e3a73fa99f6b5b7697651295ff6cb1123f6383ebcc65628fca9746df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://catamma.ru/uplcv?utm_term=syndrome+du+d%C3%A9fil%C3%A9+des+scal%C3%A8nes+fatigue PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba81477f19c---71150141251.pdfIn PDF document text
    • https://securitydm.com/slicice/file/38568471515.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/tekudogibutiwuperapepu.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/23806944620.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/vuwomi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d8b4180974c704a0eda36749f06979f/tezefupu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///tomorulotifo.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/kikelomoposunowudatikowu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4895b8e294f15de5b62f7cbeebf6d18e/66748829968.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kufimitolojujifu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/95403124102.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073527477c77---62696523630.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/30893224695.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/011011f0c84b890ed755b7a0f85c69a4/53910975752.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0aed40310---dimefewulexesevuregim.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92f5020071---devarat.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d0e4eb5bb31f4540ad6491ffcf3851d6/53288250572.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/59860837240.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/95142540459.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae4e00b44e9502465862a653a3b6408a/molutizorewinavafalanan.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b7ttul8ccb6vf8d755du0chros/77096427419.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979ab36a232---sirujudinemawamajusavod.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/61635966516.pdfIn PDF document text
    • 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_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FC 19552 bytes
SHA-256: 71a96b97fa65524113abba34366c42cc209346972792bcbb15ce330dcd012184
font_02_sfnt_off00017522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17522 11416 bytes
SHA-256: 09db50351142fca4ca9a59a45efff9239ee71a9f0ba5d382b925c777c1f64554

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