Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5f3f08d8150cde…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 23:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6367e66d649e86d7f093140ecfb7e48 SHA-1: b7f34e2bc7c1bcc7aa946d9e7e5de834df35e4c7 SHA-256: 7c5f3f08d8150cded35ba62396ffa385562bf7e72946f4b6f2184027c75afeaf
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further supports a malicious intent, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://pitchdecor-construction.com/user_img/files/vikavavavazalabunekudum.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d4e54277dcbd87d874061e73c02ee9fd/wunelubadefezisuwug.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jeranisoxazavelajewufava.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/7644552087.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9a823520---voweli.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/debopogikadatukuwalaler.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/89186068122.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/manevupokuronus.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3s5eaaef9t9bbpmqk2vuc7tc85/86933955983.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160741af1da15b---20260440848.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h8c6j3qq40advou80ei3tij7s6/wavewasogor.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/51843607442.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dozaxinodapalusepavunadox.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/47453209755.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/86177404254.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5n891n3mqhp78nl1f9bh2hhvsd/59807180085.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/fajixodiwigabupekegagini.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4877a076---53174387832.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160992049aa318---94420711905.pdfIn PDF document text
    • http://esistore.de/userfiles/file/64603834377.pdfIn PDF document text
    • http://biomehl.com/images/content/files/37460476421.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/rodelasizuzefifuwulu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac5480d3f---22259198057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=acharya+atre+books+pdf+free+downloadPDF 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_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 11040 bytes
SHA-256: d7e7ccb0efd30fcb82e799d8f08602d8caa866444b196ff66f4994fe548bd0c9
font_01_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 17768 bytes
SHA-256: c246ad0f0e9786f96cad2191311cfa9f6ffc9323554ded75daf8f8ca60f8b972
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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