Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d86d0237b38c0f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 23:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33e2d74a704b1031e2226fa01d963146 SHA-1: 523e12ffca8d53e334aa2e74044bd956b679452a SHA-256: f9d86d0237b38c0f741527e20e3201ade32edd57618231374d0b86f5d030df34
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

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://irlanc.ru/uplcv?utm_term=game+center+not+working+ios+14 PDF link annotation
    • http://codemessaging.net/ckfinder/userfiles/files/40541877764.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b34fddc0df0---sudaxatobirona.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/dosafabom.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/kinodijolulabibejapepon.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25d2d8cc1---vuzakukavijukilipel.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/50907148759.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/88264374503.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc1b874073---forofebukewizime.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vuxovez.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f97c73e02---92450396731.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160910dd09a805---gowarorajevan.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b885df00c---28227004503.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/sikotebofefi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b461ae25a0949d66e11d4bcf5e5bcd0d/24388476535.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0df50b96a---28926135569.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g6dasna67lr8erq43bspoheo8i/vevufubemujobelimej.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/topupiwubefuvoxisuzotifi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ddcb395c8f5ec70ff72e3486c00c34c3/vexof.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d9422c4de39defae599ed0f62829773a/64055957909.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/polap.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/16840846880.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vemawulubetubumipigufido.pdfIn PDF document text
    • http://446888.top/userfiles/file/sotenatowom.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/79236426576.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/sapapa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab277cb7984---18384534144.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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 17380 bytes
SHA-256: 377aa41d3fe3373d7095aa6b1a192fc4db18255caf29f3021d6e013300430fc3
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10876 bytes
SHA-256: 37c8958ba7d52bfebc3743030a01ce56bb0a6b6a3b84aa3e77e4a694dd6f4ad8
font_02_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1