Malicious PDF — malware analysis report

Static analysis result for SHA-256 19430abcdfcdcb56…

MALICIOUS

PDF

92.1 KB Created: 2021-09-10 09:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08b6710b531e74b6a41b4f960dc27fa6 SHA-1: a21b122dc78779640ecb6c28d645274d5228942f SHA-256: 19430abcdfcdcb567657694a607cc1ec0d948c6b153a8e5f7eeb90c1c409327f
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ain.proximeo.com/ckfinder/userfiles/files/62025042003.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/82492287009.pdfIn PDF document text
    • http://wajl.net/img/file/202198115658.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xogedefazodapoz.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/safuvovuw.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/nasinekuloximowo.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/45693644113.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/bejipesado.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/wusipox.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a2ea5c8a084554947f254a2463fa379/34800550359.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/vaxepokobex.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/sowusugaxubira.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/korixefutekirisojofuzos.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/rumitapedilaz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aee5a59eb09a61bcc94f04fd8b1faa58/27512049481.pdfIn PDF document text
    • http://aa-nusd.jp/sibozanijal.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/kedavoxuzajisoniwaf.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/xilenumodivekaruwezowora.pdfIn PDF document text
    • http://apicn.net/upload/files/80665501388.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/70692690820.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21867958759.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abbe5ff4e---31377369357.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/naweruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=movie+hd+for+firestickPDF 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_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 10412 bytes
SHA-256: eb9a472e4c282b202affe3c44b9a4e19c0985fffb3df6a6f545fba23255b0ed4
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 18724 bytes
SHA-256: 58aaff7ab9a89abe4c4beb6a7d30c0f1915ac5a490af8d84fe8ef0d4ca5984a9
font_02_sfnt_off00014aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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