Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b3b841f3243c3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 23:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a90fe5e8b9bf168e7c5fe747d42431d5 SHA-1: e5d597016ae4451a6d360322b406ede2b77e29df SHA-256: 841b3b841f3243c34267681b8025e87cd29779450f42ddb2e14dcddd88c7eb2a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, utilizing an image-based design with clickable action triggers to direct users to external URLs. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, strongly suggests an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=dbz+budokai+apk PDF link annotation
    • http://natalieshuff.com/uploads/file/86944728701.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/91408085088.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xitafudijifitiwupi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613200a96e04e---loxad.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30993503349.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbl729appokt0mq7smh09aji30/morefozazakavofi.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/28578097090.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614423bc2874f---3091330558.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613227646676b---82058529783.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3fe82ad79ac62b9819142a48038c7096/38196536362.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/tozoxexikotiwo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kufogarolovofewasuwito.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jemosokazozigiferive.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/38813208595.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/50336370449.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/96466825180.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/vovevaxebez.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/34182207228.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/nupigukututibuvefitubewo.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/sesiwezujesapuguwefuve.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pazodirebupizagu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/50084888362.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/444706344.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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 14680 bytes
SHA-256: 24650ecd4e401e65e774197216375b4b0451925ddff89203890558544fa9a572
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 10132 bytes
SHA-256: 8638c5893754c3270808334c51d542d5d746c28e0e67143732afd6f8c19b4e2b
font_02_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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