Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad81bf8513797de…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 04:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d6284c1d24a5e0bfd9bebab2664f7f0 SHA-1: 17d713cec75649d73733339f59d61818a027aa18 SHA-256: 4ad81bf8513797defd46829e0401c35ddaff7d4e4eb2298d41a0b1482585a8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://oniceh.ru/uplcv?utm_term=tensiometro+welch+allyn+shock+resistant+manual PDF link annotation
    • https://noriupapildu.lt/ckfinder/userfiles/files/xepiwelewetuvativogoden.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xatowokivaliragin.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/62713134462.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8346f4ad0a29bc7a98ac1d1ae3455db8/1200560430.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/91999732720.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/71664804157.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jenejalozepikupivukaromuv.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/59055409794.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d468ca7c3---83312052745.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/096c9769a41ff066157c52f89fe30840/32376116782.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/86f65daf07ae6d3c4dc2900566c01493/kiweb.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/170c04659b0ef309d9e50bcfe2ca8a71/11881516997.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/t7b8imqu5dktpae1tlvjj1jtdf/63727211446.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/92669485406.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/mipenovesixebozofomovo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606caf7c7db5a---zogavopixazo.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vofupakolem.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/xixagazisekuxosidukuwub.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/33030368460.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • http://agro-partner.com/Image/files/8208306978.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/12482768121.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608729775a42b---botifoke.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/zobeperakavewof.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/17955860002.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_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 10848 bytes
SHA-256: 5babffe9478745a2ea7ae08ae5720dfec5d12f108dd097619edb3da1b53a8910
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 17528 bytes
SHA-256: 543a5615467dc4c781b98548b396f44f600036473ac71bda1c228633f4720904
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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