Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bb3622083594d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 15:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdd7b8dd3aec971b81d1be296af679a9 SHA-1: e4457c334852281cd34cab4ee0b5d55a7b22dc74 SHA-256: e9bb3622083594d9983f34b76cd84fcd732b5af43257616acf92cd8093b8869a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attack pattern that leverages external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=communicating+in+business+english+pdf PDF link annotation
    • http://acecaalcoy.com/userfiles/file/77382012504.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/27460506613.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/laxufexot.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zizanigugoresapu.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/mewunevajegazuxuxi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fefeee79b1---36654156158.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/zogubagajelejikewotaxozud.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/c77i0tcgi1pb9vvk5il8hr8v10/83233057668.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/rozijisalile.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/23334155279.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108011632525910926w12s.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/48649557038.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/24233664570.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/74943741023.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b730b990ba3---88948417575.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a64dbfe5---linodapixigo.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/83580641510.pdfIn PDF document text
    • https://onwater.my/uploads/file/93737937301.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/pidaniwusad.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/45504c3c53bbbc5d6210df2267d49462/dixamerusov.pdfIn PDF document text
    • https://ocw.tw/uploads/files/7142520589.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/q92iurv98dg0oj817c48t40525/93927833838.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/zibepitafun.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2m5gflplslbjqildc31qrmsn20/20622839427.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/60b5aa13c97eddf559b3a352c99eeafc/95496954760.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/72399508937.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2cd45135eb6e65a7ef4d4fc810b9a088/11706808358.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/porufitadozugi.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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 11240 bytes
SHA-256: e745c7d4234ec068e3ed7d0ed9e20c357bfd8a99e2337be7820f3730fdebe9de
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 18120 bytes
SHA-256: 2d633947121fe25a5c3789a09c9ce0bf8bbc1f3ecfdb73930a6e317af3872039

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