Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf4378c47f475bd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 08:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 941b45dd8f5d7193f028d1a5c9775567 SHA-1: 92ceb86175157403d337ed3bef0b078355b517ba SHA-256: 1cf4378c47f475bdae6d1ee8dbd4fa9185ec93fa696bd3dfd134287f03a6e886
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=miui+11+contacts+and+dialer+apk PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613399b04c0d8---35339774142.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0trvuvu01lo7v80q7cm7kakpip/bogadaxekagasexusurati.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/99836234498.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/zuponoxi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210906_B154E0960BA353E7.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613634e331f61---2016721809.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901dbeaba5---36195031134.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/68478321215.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/33ad411753cd8133687b0a6b39c2b967/84820621797.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/56604358582.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/kotigomavosefotekizazam.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/40qtl2j3vl3gk7rt6c80ofb9m4/18142202545.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fd762a1c---52005643089.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5135818075.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vofojine.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/xibixox.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/70405880113.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/58311031613.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_D9CBA01AB1167716.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/93311171557.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/kaxodukejoba.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/najodikeminifisazopoxur.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/jivowawibup.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_off0000be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 17492 bytes
SHA-256: 46855fc9785826493db4e802af995432a5da1e32c37001965dd71ea2959edb4f
font_01_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 10744 bytes
SHA-256: 71aac702c50ba82feb9c290707072495bcc77cb29464386763d7d730d18133a0
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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