Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8351a8a81af7a5…

MALICIOUS

PDF

286.7 KB Created: 2021-12-22 22:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: aa169361880ad911647855d5fa0c9398 SHA-1: b3653e2dacdb7ba122e3ed4b9cb3577b9ef16661 SHA-256: aa8351a8a81af7a52f457a99cf51ced99a3fddc4de1cc286b7ca0ee7f06a2efe
174 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6835

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://slezanie.eu/userfiles/file/60960313387.pdf In PDF document text
    • http://tw-tms.com/uploadpic/xw/files/32263983069.pdfIn PDF document text
    • http://lk-atomexpo.ru/web/js/kcfinder/upload/files/52233252401.pdfIn PDF document text
    • https://uangraja.com/contents/files/70411042263.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/vivibamisiw.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/zenebemazowapemodevorim.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16176d567552b2---244845652.pdfIn PDF document text
    • https://luquluqu.org/public/assets/js/kcfinder/upload/files/tevawalizapuboziwuvunedo.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xinukulolewutowupene.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161c279a092e9a---11306504715.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bunomizebasometu.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/3967239311.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/metagig.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/37674273991.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/98197548123.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/48131424311.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/maxufi.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/xebepat.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/99738468673.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b174ca7---7773011123.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/sikogexetomosunetaro.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/95985105134.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/tekafokewo.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/76214046473.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/zujurojavu.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109200059417717413zidhk.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/finedo.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/84067936650.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=orangutan+jungle+school+episode+guidePDF 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_off00040a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40A60 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_01_sfnt_off000420ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x420FF 18608 bytes
SHA-256: 43aecdff547b6e0b64384382b9fb2f89423c660be00459851be23c0f9e6ecaf1
font_02_sfnt_off00045206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45206 11048 bytes
SHA-256: bc19396ea707671072aedd34eeb12dfafef7c3e6ee53ad9a45175988edf6c361