Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f67c79ff53b1aac…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 07:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc2ecedb7dcb2f1f305737c470aaa359 SHA-1: d990df4b1832235a0ce7826c2a6562bf853c8c9c SHA-256: 1f67c79ff53b1aacac6490af70e4f97753d2e458019dc6619373eda632fc768b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=funhouse+movie+2020+watch+online
    • https://sakura-bashi.com/uploads/files/202109130505575565.pdf
    • http://panova-art.com/files/file/bofodutadutujutokoget.pdf
    • https://underworldgear.com/admin/images/fckImg/file/kaliwoxanetodidekibosuzi.pdf
    • http://huiking.cn/uploads/file/132157468309.pdf
    • http://birizgardenhotel.com/userfiles/file/95097243585.pdf
    • http://mamam.by/upload/File/file/fisugawijegexes.pdf
    • https://webmakler.org/userfiles/file/29032911288.pdf
    • http://www.mattig-accounting.bg/fisiere/file/togakadesinubilufe.pdf
    • http://motolargo.pl/userfiles/file/45250125182.pdf
    • http://kunmobile.vn/files/uploaded/20210910/file/karif.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/31513545475.pdf
    • http://szilasfood.hu/pic_upload/files/liminoralevenesasikivuj.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db539330eb---64500360240.pdf
    • http://geometrarontani.it/userfiles/files/96689456483.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qr7qfb8cq5tlqcfdlso3eavnl4/delunuvixo.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/mepilatibo.pdf
    • https://vresponse.net/userfiles/file/nogovuraz.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9f9bcc0d---misaberebabusobonexe.pdf
    • http://gurolmumcu.com/userfiles/file/15254672507.pdf
    • https://cissud.eu/uploads/ck_editor/files/kuxajejuxagopixexof.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/57938688222.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b7.bin
2e60ea95e66d3bda9652096255c5e6a84824fdbedaf8da913b60f943422d2ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10864 bytes
font_01_sfnt_off00010ec1.bin
f27535d83771ecb99d379a8b5e164b3036d7ae93c9166f1ab853d65020bf296c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 17596 bytes
font_02_sfnt_off00013bf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF2 16792 bytes

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