Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ebc115acd27142…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 17:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38c275ab85bbddb25ba9b7be57d780cc SHA-1: 53f6e708632635f96e6f5786c5110617eadb301c SHA-256: f8ebc115acd2714236f25c97160d11e6e665509907f2d92f3706347610f7853e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into visiting these sites, likely for phishing or to download further malware.

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://crewmak.ru/uplcv?utm_term=horror+field+apk PDF link annotation
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/pejawimiropij.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lemigebabovopuv.pdfIn PDF document text
    • http://edituj.cz/res/file/kiwame.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/gopobosetejox.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/xixexinobolulapevep.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wusiwafibi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/soziketutonoxagawiku.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/selilomumozemerudekoko.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dd3ccc45---dagojediwawopu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f398cc3b---vaxopoxeborojijuw.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/79225449329.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/60661102005.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/35974331164.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13148968860.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/65996838715.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/mowarexefizujodadowo.pdfIn PDF document text
    • https://majubesar.info/contents/files/36085051520.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/28013107456.pdfIn PDF document text
    • http://gabortech.com/admin/file/47608034545.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/90174103406.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/wanuro.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3590a83d2---40952221572.pdfIn PDF document text
    • https://izometal.net/mm/file/96734321171.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/83544735178.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mepepoxijetaruti.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1ef2eedd7d6a4f8d19f352cbb9e87f9/6524116411.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/29665223572.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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 17520 bytes
SHA-256: 533a5d8e7fd4cd54e30eafec12ce9bef4f0b76bef7a118f471f928dd56402a4b
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10204 bytes
SHA-256: e7c98e38df6ce090f1de5f6b6cd966da48b2ad0106e4f64fe9e1fd6ea9582cd4

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