Malicious PDF — malware analysis report

Static analysis result for SHA-256 632eada80bfe765e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 00:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7db930f943c630bb421ad4b42ef2a4a SHA-1: 1332187e3f239e5bef8e2b66bc0e9b7be5e1dd8a SHA-256: 632eada80bfe765efae75b3f2b1f663106c882889ce7dca6402167cb3b044f26
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may host or link to malicious content, potentially leveraging JavaScript for execution. The presence of numerous links to potentially compromised websites and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dworbieland.pl/userfiles/file/78223709825.pdf In PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108080611054053.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/wakenivometizivotuduru.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297a54a518---92836319349.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/majelikejekirodinolo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/72495340858.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/5513686705.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/satagegaper.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/83884295076.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c18569031---59953201378.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/19847835701.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/23259058284.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfc04c2f4---25863224653.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/sujexomawadaviwunalina.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a68dcc545---geboverevunotobijupis.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/86181257854.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/30678688208.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbdf676c5---31494086030.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/51746488372.pdfIn PDF document text
    • http://nenorm.com/files/files/16279110870.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/56150485841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=screen+recorder+for+pc+32+bitPDF 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 17816 bytes
SHA-256: 4e67b8019c05055a8863c63644d0f25d02d61d2fe4a55f72deb82ee12dd2af43
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10744 bytes
SHA-256: 5c5449c81ce3a1f9e50621df9210404c888c946a07af21020f9b6a84622fcd1d
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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