Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c89ddacce71aecb…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 11:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a6caf591b7c5ee68d0d824d2f6b8896 SHA-1: 88ac19c9aa3c2ad795e2958ce38fa8adcacfc85a SHA-256: 9c89ddacce71aecb03da54989d6d6a255b3b9bf83519f4ef8b887530a126aba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link-farming attack. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=burnley+manager+sean+dyche PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fbab46975c634a08ae4e930aeca7f963/58369809446.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/29849958372.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/zigixabuwanolunat.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/14a8bb50cde73606b8cfa8de5e2c9a25/92755279425.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a4804b119---nezujajizezapi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096251fc5b16---taxuvoxugimesefitoj.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/bovukibele.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba6598f64---54357529139.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac14f258aff---laxixopuzapu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/17623853181.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zomobow.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/30277997478.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0stp9cdnm7vietq2micilkrram/19144860546.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/71031259244.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315f0563d4---41537986443.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d5386695---gijalinufebus.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdfIn PDF document text
    • http://ahchala.com/img/file/gevupetujazuxadasug.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97994432152.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mipozevoritideguvagexu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c89f890d462c32706ee8691c2fea2f47/tofefepiluraw.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/38bc4d192e9a10293037a03649c63d06/mubawuwito.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b8f7e0d3---91793731980.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621073344.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/towiziv.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m4u9orb25ctgoev1h0rusulu50/20447695717.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17656 bytes
SHA-256: 9def1e99d0092eb796bbbe8cc7f2c98d4c72fa106901806a498562c715dd972f
font_01_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 10776 bytes
SHA-256: eb810692f64e69303e809e2861245bda2e12e2ed3f517ff062b15ac941c788da
font_02_sfnt_off00013622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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