Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f54c7ad5cab88f3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e6a17262b88b1e7ac7e1abff45b7ad9 SHA-1: 06fcc2505f7d7783e8949c02242ffbeee05d8638 SHA-256: 0f54c7ad5cab88f321bf25fe3dc3b61845afe1964e6f3292d9929f611924bf1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a harmful purpose. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation scheme. The presence of external URIs and a high number of distinct hosts indicates a redirection infrastructure, potentially used to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://arch-teh.com/pic/userfile/febamem.pdf In PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/pibowudo.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dirupukeramavujasotaxeja.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gadarum.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/84823442612.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/10956083245.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/zugif.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/vikuv.pdfIn PDF document text
    • http://delve-cr.com/uploads/kudakuke.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d512d9e20---farovefokuletonolabuwuvut.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072869291ed0---86217175248.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b0f1b64237072549632a21921026504b/zaridado.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fb62850afae4e2caaa0157aba18eddbb/11025365287.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7e9e1712cd8d612db3da4e661a0c1307/pevupowaxibatuvexibo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0954262a---68887854227.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisemotuziwakepebiwizale.pdfIn PDF document text
    • https://agermag.ro/mm/file/xubadajuxuf.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c9687d6801fb4ea32914339d29c30f4c/firivafeni.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/gulisupijinixeselenone.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zipefoj.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5584650914.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd6da7ccb---18371260201.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dcdf9d5334b636ae9435390f80127a3e/vilevugatoritipabozufoxax.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/52546814939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2014+hyundai+veloster+base+manualPDF 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 17160 bytes
SHA-256: 98391941fd3b89ec717058d14a477a5c68c0ccf9e2a1fa59fe207126bb3ac3fa
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 11208 bytes
SHA-256: 30b2b127c727a3bba0bf5f520d2ec5ac81fe8a54ca28fce3e3c6cf625c1f69bf

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