Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb837ba0a0f7c91c…

MALICIOUS

PDF

670.4 KB Created: 2022-03-06 01:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-05-09
MD5: a83111ec67aa8606ac32dfb0437f5a25 SHA-1: 04284882f73db9c97b1e03562dd95b29712e5a01 SHA-256: cb837ba0a0f7c91c5fc1e07fcf2c1bcfb1c40c9597d45f389ee8f90537163690
136 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2721

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
  • 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.
  • 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://dragonexpressml.apnaconsultant.com/userfiles/files/7106687631.pdf In PDF document text
    • https://www.kpglearningbox.com/assets/kcfinder/upload/files/91637565096.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/nonemogirenisumu.pdfIn PDF document text
    • http://synowka.pl/galeria/file/zoxodolomodifapewav.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2022/02/14/lixajisubaxuzume.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e58d5e06ce9908a36c051254189a51f2/73229333218.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16200121d7c7c7---bulidimovesu.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/nabesaxamovu.pdfIn PDF document text
    • https://marketlayer.com/assets/kcfinder/upload/files/99928993948.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fazozupu.pdfIn PDF document text
    • http://www.sindcomerciarioscs.org.br/adm/kcfinder/upload/files/fanowi.pdfIn PDF document text
    • https://www.mvfht.ca/kcfinder/upload/files/23872953097.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/22899324639.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fafusilevumod.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/73716555921.pdfIn PDF document text
    • http://vodokanal-proh.ru/files/files/56000732630.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/tetekogufavovorupizumar.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/162187d9617b8c---25065283414.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/venisujidobeg.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/97157654573.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/44460335507.pdfIn PDF document text
    • https://dtcm.meetingmindsexperts.com/multimedia/userfiles/file/75357807003.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/vurasenaz.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16452185711896.pdfIn PDF document text
    • http://tdbm.vn/upload/files/5597226651.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/87323312721.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/xewelesaxetabe.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/mazekeniwibagerubafe.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/34222134058.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/25718014063.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/patuxofibuguwiduj.pdfIn PDF document text
    • https://iwistw.com/upload/files/jumalanemetoki.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d92eb6f1p1r97n852mvfntslu2/2209492609.pdfIn PDF document text
    • http://zzweien.com/d/files/52807275128.pdfIn PDF document text
    • https://colod.co.za/XSRYdR1H?utm_term=ap+anganwadi+application+form+pdfPDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/54858964810.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 extracted file (font_00_sfnt_off000a09a2.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off000a09a2.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000a09a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09A2 18704 bytes
SHA-256: 4e655351b423c6203ced4d997c3c3ffb6588871f4e583cfd1b5db1d1260b2df4
font_01_sfnt_off000a39f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA39F8 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_02_sfnt_off000a5118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5118 10728 bytes
SHA-256: f997f2e9062c87c9fa45209480085b8cd33322760cae412764258588a19b72d4