Malicious PDF — malware analysis report

Static analysis result for SHA-256 155529c1871a8257…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 05:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b1627a39096695a062e70eb491c8a9f SHA-1: 4d31e4c0435e09f206f64cce219bfd908d73e775 SHA-256: 155529c1871a82572b8c35cfd1763f7f2d9b4f73bde74b614bde0dc8be08e131
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many hosted on compromised WordPress sites, suggests a phishing or credential harvesting attempt, or a lure to download further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/aa279c2de5746254b56e8c7c315a675d/80420744996.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099df119c60b---dages.pdfIn PDF document text
    • http://centronegozi.com/public/jawuxanunedago.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f167aa6d---45276802422.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bb5d24e9---migiku.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/39379507213.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58d96ce4a97370bccf4d249af52da627/73309215744.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/96876044678.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/97671203542.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6c273847b827484782d9d391a032cef6/zolodurojilozufexeruvavod.pdfIn PDF document text
    • http://raczcsalad.hu/files/18403770362.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/41417114739.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/75295542846.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/dixemizuguzepatiluxiduge.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/11271287979.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/muxiduvusagetomelegugisi.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/48316020734.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sutosibevivudediz.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/90977730637.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c4d4317c---ravoxejujorinixo.pdfIn PDF document text
    • https://service-panev.com/userfiles/97915994977.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5vd3gkcmd52ili4847ncdtmuuh/5627822239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stratix+5700+manual+de+usuarioPDF 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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 10992 bytes
SHA-256: a9c636cd2f0f4380f16101c014577491f8e9f45c5c71b7f4ad6e6168809beaa6
font_02_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 15628 bytes
SHA-256: e94a0dfa54930b52a12c8f5738cd7f8389cac6db0d3823a66d2e67f3b507035b

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