Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e682b47d8b76e7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87589ca6037ce1eeb165aedee2f2bdb2 SHA-1: a4957210d7c51fb5b18eb8b5378dc7ed4ee884f7 SHA-256: 42e682b47d8b76e7b709f3bbca1099ff80f283cab65bc0360287a7952d80c8f4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of urgency and download button lures further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://queure.ru/uplcv?utm_term=main+hoon+na+full+movie+online+free PDF link annotation
    • http://phone-server.com/userfiles/file/fevexoxoxixikuvite.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ebe57b5356b6e3c01d9b2a1d8513e3d4/40451801569.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/27833104460.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/tulivusejapelelekuveded.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/dukuluduxikekuwekop.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210916_EBF5572E0B28A73A.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/629c00531d7747c7e3794174013ccce8/4371436274.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137655250a1e---gewufopikakelora.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51b423984---sodizu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/64f350338c74bca41db8e27514b5ef36/4658543748.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gelutesexuzigeraxuzu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/zatutaxibuka.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4db1b017---2944884565.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/74173854124.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/xuxazave.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/46599547434.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202195151553880.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/99725889937.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bapuvotajume.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/duzotewumonimimitu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090516450173499.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/16610509557.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/nubagog.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/33118777843.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_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 10372 bytes
SHA-256: 48b60a3cbb771bc8ba701e3c7934498d6b508def45c9e0fba3181870948fee61
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 18440 bytes
SHA-256: e77935896414ee4d90cd20dd0017cddd19abb0193bec5a4b640da3d3ea91069e