Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bca84e782e17391…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a59b92c6c12b8a4f587b79231fa2727 SHA-1: 9c600609a01b3e1b672893c32e80c1ecd9768bd0 SHA-256: 5bca84e782e173915a7987c26674ab294c7548be0aae8c4ef42f569cbfd25384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=android+power+management+app PDF link annotation
    • http://z-i-f.ru/userfiles/file/75496820516.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614c98dd3c1b1---wagabiviz.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210924071500.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/35635026439.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109060249173200.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/51330001069.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/82164886364.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/48145867316.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ak5v8b5sg9g16b6h6sohs8rkg0/29991004951.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nenep.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/minubu.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/81110759198.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/79778788561401394bccb4.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/1090239808.pdfIn PDF document text
    • http://musikkursus.dk/userfiles/file/58898967257.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210923012739.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/378aa300d2917978ed28d724c2f30d9b/57581032825.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/82554627797.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138a60181b59---silam.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/35221255126.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kfvho1sccghovsg30m03vcvvhp/57874687963.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6b801f2c---99069003169.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zutizakejefi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/35527879560.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 17436 bytes
SHA-256: bcd692ad8d01bb41828065eed328112c3743dce93ee4de34911333d4941436d8
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 10588 bytes
SHA-256: 83ce3117ab457fb54bf3125818064f59ea8aebebbd1d74c29af8645644905750
font_02_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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