Malicious PDF — malware analysis report

Static analysis result for SHA-256 f915cf0d45e4ce89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 04:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d529d5ab6085f48ea57d6e5f872ac303 SHA-1: 6c5bebe6af9b51b818b315f9f6cf8bbcf1966e43 SHA-256: f915cf0d45e4ce898fe1c004b405b5d1f2894fd36788ec153dc66573eac37014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external links and the nature of the hosting (compromised WordPress sites) strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fabg6jn58c4cfkqnbsr0jgkdiq/38519615.pdf In PDF document text
    • http://techbis.pl/files/file/timuvi.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/vumaziduze.pdfIn PDF document text
    • http://vucert.vn/uploads/files/panikipaliviwavalewuzubu.pdfIn PDF document text
    • http://htygroup.com/upload/files/43892236137.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/tolimowizazav.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d65327c55---xanixosekukajemipa.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/459da05de75b8301c5982bfdb419b92c/87760219816.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xapadibozuganoduvi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160898328daaf7---todikosowop.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/tigira.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c2472efd---lemufe.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/fosavusugejobugoporo.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/ruralumibirekure.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070116ec09a5---fobiderufudoxupudonipima.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/figilulojanazurefudopil.pdfIn PDF document text
    • http://atrsara.ir/resource/files/finokezadero.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/vixeke.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66c688086440dcca197e915b701c6d2c/tegudugaziju.pdfIn PDF document text
    • http://vina2002.com/uploads/files/moduxejez.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54de29e4e---roxevolabuzaj.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0a79719bfc70a4203ad49bf1c8960ccf/karupuganegisokadagif.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/nobokuvujopurajej.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3dfc89b2f6b9a9baef6bce0e9cf7e05d/97373341543.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/xivevovavutesugilazobufa.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/42929266008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=afcat+question+paper+with+solution+pdfPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 17168 bytes
SHA-256: 7c4909f215ab30567befe65d63cc8cd8bfdb78c572db7b1e8b8415e644a0f123
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 11032 bytes
SHA-256: a9dcbb6251ce6d52f404c6c5f03e03fd84535c21cfb167d105a1bf156561e0f7

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