Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea4f6666240e375…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 12:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9724ebaafc53a1d5aaaec18ba129d662 SHA-1: 226be6055a2e03613349efd4ef598ef6fff6d517 SHA-256: cea4f6666240e375791262f22581fd59ad3c6e40eb02a59bb133572b9fd13525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to use these links for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://laborke.ru/uplcv?utm_term=pdf+download+apk+for+android PDF link annotation
    • http://tnslib.net/userfiles/files/82836473271.pdfIn PDF document text
    • http://happy-land.hu/editor_up/linimu.pdfIn PDF document text
    • http://vecsecity.info/editor_up/91561078001.pdfIn PDF document text
    • https://e-midas.ro/files/file/voxorodagivisej.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/30573611394.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109180626121832.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/55771103667.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/19283396630.pdfIn PDF document text
    • https://kaisar168.com/contents/files/mupibomerinevefodugazutej.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/fanozojikopunuzoke.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143986babee6---wugokiwexew.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dukepi.pdfIn PDF document text
    • https://kar360.com/resimler/files/31901368126.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16146f3a6f249c---jodojumudaworekunipovide.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/zarivalenirizuxuxogijew.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kugerowuvumonufegomixifa.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56289729329.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/35b1601ccefa12af08f5c201cbff5cb8/nozelumitiridililari.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/98043015092.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/27514094136.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///62046699646.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/29292696014.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/xexuweb.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210919_4B84D5A9E1734144.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_off0000b067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 18280 bytes
SHA-256: 15904e77da4dd4b27164f09f5fbf8bcd35b8c97c4461a5cd741251b4c4167b7d
font_02_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10272 bytes
SHA-256: 477b20dbfa0ece9f0786def2890808cae1a8acc7dad178d375381d160c09f8d1

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