Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c79e88fc6e089d1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 22:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99250626e1df379f7480487f973f972b SHA-1: 6a5a654d4447a36f5e1cf510c1db85244b721a1b SHA-256: 4c79e88fc6e089d145fbd704e61d42342e160ac342cda0fb8e823a75f55f7ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, embedding numerous URLs that point to compromised websites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking through to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/562ed9f35355421c72324bd01a071dbf/93932236657.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/c9u2mll7f6eshjgl7naphgvivq/7377276485.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/94395493954.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/5532707569.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b68145b7ff6---21153107797.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43b977ab46adc3b781795eb4e1c768cc/64426905875.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076b261b3c93---zisuwupilurek.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/9586289460.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/2747422667.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/dumixodofizinevogelegowo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ff894a76---66547545692.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0d1ed80de618fb73e992b84e91995bbc/36423466840.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/daniwunetebi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/095d05b71e31274ec830b2522a985dc5/wutibeso.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/dupafixi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lozidigimagotito.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060521571373499.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2827edd7---2843094801.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/44744077756.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/41200043942.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e069973228dfe718363e5ba60164c54b/vufexejamozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=software+engineer+objective+statementPDF 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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 11128 bytes
SHA-256: 803f0861cc64a951c983133f38d96d8edb50f1e6d2e7859764e140f5e619ca12
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16608 bytes
SHA-256: b9dc64e1e302a6964f4ca772875e70615b12a0600a5e22bfe1ef1c206c80896a

Open this report in the interactive analyzer, or submit your own file for analysis.