Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c8e07eb8bcc9c8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 06:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de58069b45fae6b6635c4a933318c7c6 SHA-1: de77d1d5db088ef4532d8ea5692a6a65f11f9848 SHA-256: 78c8e07eb8bcc9c876912965e2c61eb3a610c7e116a6acfbb78b1d1e83af0048
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://yogaschoolofkerala.com/photos/editor/files/bubedekexilipan.pdf In PDF document text
    • http://bogieclassof67.com/clients/71235/File/zavalurikuwilofuzewon.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/19339212899.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b183b0cf67---82911134679.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/5904580875.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/67316669878.pdfIn PDF document text
    • http://abwessex.com/uploads/files/11666063902.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae3153ca4---21001197231.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897e772af6---zujotepugefibavegerixim.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/66885687567.pdfIn PDF document text
    • https://x-software.cz/data/file/53092192715.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077b87d9c---69984230708.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zaxozitaxov.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a07b689601b1d0f0753854e1c88075c/lanop.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/72070135270.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/jiturapa.pdfIn PDF document text
    • http://koala-al.com/d/files/84511011919.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/julavebife.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/87070976871.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wajax.pdfIn PDF document text
    • http://pnalog.ru/images/file/zuxukumokolifuwaz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc64a19f8d---faruwezuwilix.pdfIn PDF document text
    • http://minerva-collection.net/files/files/87483161861.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/70905784998.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/moler.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010f3fde828---fakuzorarawuvemalubeb.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a62a0f3b9---fagebemomawutizipiporef.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/85138165024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3+pedals+in+a+manual+carPDF 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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10632 bytes
SHA-256: 932cb2662ff15a313fda82d7b5dc5e3c528fe65c6cc2981b68312599b48c673d
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16804 bytes
SHA-256: 3a51a5196a7ba825f43365de422f3045fee243718445a9d782473fdaeef96eb4

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