Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b93190d2cc3aa57…

MALICIOUS

PDF

103.6 KB Created: 2021-07-19 10:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15a74c7ba316d678b951cca075601d58 SHA-1: 5b586c0dbe4eec80f732ba42976a11a3b44b2c3b SHA-256: 1b93190d2cc3aa5739463388306c001abf0cbba92d305a7cd015f5b7ae380399
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to potentially compromised websites and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. No scripts were extracted, but the presence of multiple external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://majorsagilekvaros.hu/uploads/file/bifizifulosarafokeda.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/12675684138.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/letuzujufisijepux.pdfIn PDF document text
    • http://zxsolar.com/d/files/pejufevomedisaropufe.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/firutowerarugusibunamowez.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/wunatewewi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u2gg09mpruce17odg2dvsk6auj/dorutasowaxomadolofog.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4f5829e9---fipodegetetonelav.pdfIn PDF document text
    • http://vizcsap.hu/files/file/pidep.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/76985230752.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098456b609e5---9681511890.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3117bb80c7---11591485097.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/jazep.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab617c3db5---girukabopelevawika.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gerawozowiwikoderivetupa.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lomulabija.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9bcb406ec2bd554705e070c5d1897606/zoruloledudiwivanapusaw.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/818338ed1943765ddd051313f62a8871/fujulorudilefowuxilozexot.pdfIn PDF document text
    • http://matras-devison.com/upload/file/91332855921.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/niwexaxumakopoxepanep.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/kivatunumadijikukubulize.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dbc6c10d1---fawudelerinudalexoxobedes.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/18885763647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=country+similarity+theoryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 18080 bytes
SHA-256: 3217ba14aa4c1db7071daa3ce9b06dac4f9715b13718742a347925c62be6a31e
font_01_sfnt_off00016147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001795e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795E 10620 bytes
SHA-256: c8aad1095473e1d1cd269e8c804230d3ecd6c65d4164a80a654c118bb6c0be91

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