Malicious PDF — malware analysis report

Static analysis result for SHA-256 44540dd7558f77c6…

MALICIOUS

PDF

279.8 KB Created: 2022-04-04 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 18921b9dcb32234affb72edb6709aef3 SHA-1: 6ca1f98ed5ae9db1412dc5e5d08c99563800f252 SHA-256: 44540dd7558f77c696bc6bc81d37342564b3d08bd2244878e2b78143e576c528
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and external URIs, indicating it is designed to exploit vulnerabilities or trick the user into executing malicious code. The presence of PDF_SEO_UTM_REDIRECTOR_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with multiple URLs pointing to PDF files, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

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://yoyep.co.za/XSRYdR1H?utm_term=canon+pixma+ip90v+manual PDF link annotation
    • http://hcstonetw.com/uploads/files/202203300756216327.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/23224979910.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/68815657391.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/162448efc0a22c---leloxoleziwosigoni.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/voxezuvitapujatabibofu.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/vuwew.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e40aa2775b4ef7026f2fa770c43465c0/mulejutuxad.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/xokozexosa.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kudadixuzuwifopofajalomo.pdfIn PDF document text
    • https://mail.conepe.org.br/public/ckeditor/kcfinder/upload/files/15754606055.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/36856886675.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/41303847365.pdfIn PDF document text
    • https://hoalavender.net/upload/files/11585714061.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/162104e2c5dbe0---59318288931.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/92297233360.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/85777657001.pdfIn PDF document text
    • https://hoongnau.com/upload/files/55370752798.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/dokavepipa.pdfIn PDF document text
    • http://zssulejovice.cz/kcfinder/upload/files/70304727482.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f2770136e510547899f77ac277928d0/gemob.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/gujuwa.pdfIn PDF document text
    • http://faceti.es/fil/ckFiles/files/87891925234.pdfIn PDF document text
    • https://www.uralhelicom.com/frontend/web/js/kcfinder/upload/files/dumodonobe.pdfIn PDF document text
    • https://triosms.com/userfiles/file/85668095658.pdfIn PDF document text
    • http://affichage-comevents.fr/kcfinder/upload/files/vovat.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/62443095309.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/66404618885.pdfIn PDF document text
    • https://jagdrevier.hu/upload/images/file/gowavagarafojepapal.pdfIn PDF document text
    • http://diar.pkauto.sk/images/_file/menabafipiwid.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/ribalipesepimarufozum.pdfIn PDF document text
    • https://www.yulava.es/js/libraries/ckeditor/kcfinder/upload/files/34320789922.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/degagi.pdfIn PDF document text
    • http://xn--80apefbdm9ah5g.xn--p1ai/userfiles/37302621976.pdfIn PDF document text
    • http://aleksandriya.topmebli.com/content/xuploadimages/file/5377872092.pdfIn PDF document text
    • http://rbn.org.np/public/admin/plugin/kcfinder/upload/files/minekamamobu.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/17788815993.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pogezelo.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_off0003eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EEDB 18504 bytes
SHA-256: cb7c2d64207aeabdc43abee4f7b888305e93fd72b0e282fad2dc6aa72a4b36bf
font_01_sfnt_off00041f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4379B 10504 bytes
SHA-256: 897d05c898df847bc4c60d53e89c5233875c27beeb6f20abb220d4fad74e0a68