Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb581183ba279e87…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 02:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8adcac1e87dade5f6159b356474279e8 SHA-1: 2650cc45f843051c0d5cc6823acaadf7b8056f5c SHA-256: eb581183ba279e87d86083c1605aca603e82d225eb773eddea10a1544194eb7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a35c2c14d939b86638826aa1522d6eea/keduxiliranakudaw.pdf In PDF document text
    • http://toshiba-center.ru/uploads/files/tubifexoxufip.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d8s1ibm03vm67kvl3r1f5um467/30325151451.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0033e19ce9---ponevakavupotupor.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6570aa746---93502262575.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jojil.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/soputujakogokudine.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/90046794603.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9c5f6faac2161d01512f38fb8641647a/bibamiris.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f298f6e7f2---pafame.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c8dee6de897a624c453e2f5e4e6b6af0/66562933913.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h215eufeu1ms6lfjh7r6c4l1s8/78116490112.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9776e2da6350299266a09754f0d6d289/17057068702.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/88486687444.pdfIn PDF document text
    • https://ivanamihic.com//files/30272477212.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/surinibadirovimovasejuxu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9808e21c---filepitifibofesinelofem.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ba98194d341a2286fb5ac20afa5c2eb2/votol.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pukokubapemepalogufedaji.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d0c48c85---29536212897.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c961b7b661---13414045146.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c75f3ea48---67181043314.pdfIn PDF document text
    • http://abpaluso.com/upload/file/22445186956.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/52kiqimtq69rg3ra6ilqra6s2c/rikegamigaxojanedevijaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=words+that+begin+with+adPDF 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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 15484 bytes
SHA-256: 92d141308365605f7eaf1718fcb7906d9e4f578f1215492bbc7f4ea1d5f85d45
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 10700 bytes
SHA-256: 254f4c55a60ec379b5dc05e4b63ff6684c4000079ba19f1167a2d03cc8fed246

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