Malicious PDF — malware analysis report

Static analysis result for SHA-256 31918e9e1def8fce…

MALICIOUS

PDF

71.5 KB Created: 2021-07-19 22:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: baceeec845ff42797dbde56de193e57a SHA-1: 519f5fb66aaa22a7d2e29fa0fdf552e381b53767 SHA-256: 31918e9e1def8fce2c2ec61c91590d7ad4a7cbc7fddddc20614580a56e31bf65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content on legitimate but compromised infrastructure. No scripts were extracted, and the document body was unreadable, but the presence of link farms and compromised CMS uploads strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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.
  • 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 http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9b59f848---bexaramon.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec16644622---42296762624.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/28033904204.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/92157021241.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a855c22c79---waruvijejuseb.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92964269803.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42700cf9d---nuzewel.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c962b78a311---35431151356.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66f3745cf7---85568279846.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/66183365965.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516044218.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/73692c879ffb4f914f4316d2fe1747d4/6423910870.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d186389c9f---74393611550.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607db78f97c04---musenokan.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7f72bde3d7e6ff9f7eea17beb23f1164/52431397575.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xisitotumobetipane.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/44085430023.pdfIn PDF document text
    • https://thepainter.asia/upload/files/86921035864.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092404c4f379---sepomademanovimotimokita.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870284eeaad---tonurakewowezurokopofa.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/gufuzoga.pdfIn PDF document text
    • https://path.mn/userfiles/files/62073188679.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0096e5edf2---35121533281.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/sogabisozijozemakinitute.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeed3204aa---moteporuxaxafagakifo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bbb63b1e---80406118654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=voters+list+searchPDF 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_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 10192 bytes
SHA-256: f476f8aa15e9883514058150487cfab0c7984b4760e997cfce1c41df2e554a4b
font_01_sfnt_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 15900 bytes
SHA-256: 5825a30405aefb5e2814d8bf16313fca1679b422109ce3fbd79495fe88a385b1
font_02_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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