Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd726bf1835dab3c…

MALICIOUS

PDF

320.7 KB Created: 2021-12-20 13:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-19
MD5: 984a900d4449e153d8105617e3e34dae SHA-1: 3584a6e22cf13f2fa785d894ed4972d6a32b3084 SHA-256: cd726bf1835dab3c694439377f42e6d1a9de3888352504bd5cc37561f0223d1e
174 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.8005

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=infinite+series+calculus+2+pdf PDF link annotation
    • https://mclandpin.com/calisma2/files/uploads/watimunupobili.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/eeecba74987a9ec79e8e81b31a2b2dcc/wopenewobasobinobe.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/70134830821.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/15293595915.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/61259232515.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff9f468b1---nipumilodukejugexidik.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/41292990558.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161493b428b053---77508791907.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/74059712861.pdfIn PDF document text
    • http://muratdizayn.com/panel/kcfinder/upload/files/19131847276.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202110272118423216.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/81039096191.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/35237504481.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1d36f9b783f1a73d8a01ea8c15d287ba/dunisep.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/rabapokatagibogenuli.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fukim.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/64184457576.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/likebataduzipuxoranar.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/92418612133.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/90073606801.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/20211023132102805.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/bojevagapipanozeraki.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_off0004920c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4920C 10664 bytes
SHA-256: 995f5021acd36459a22c50a36452a2611295536044eea2fd9d6b5f88ee4fa2cb
font_01_sfnt_off0004aaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAA7 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_02_sfnt_off0004c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C146 19328 bytes
SHA-256: 19ac4523408c40d80d6ce6873788b01121b5cad3079e8b99a1fde9fa480a75a7