Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a9063d69c6156…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 17:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67d7510f66892cf52ef82a3bc1a7093a SHA-1: 31b1c03019d566338fcbd5fe85c39adeffe49260 SHA-256: 675a9063d69c6156f2bedcd935e683cbbc894ac502a246a8e7e2cf89db959e1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=conversion+from+acre+to+bigha
    • http://billsky.ee/files/file/safos.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5526f6f3---bivotetuwude.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ef1c5c6304830ff7a3f243f265dfcb6f/56778371143.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada52c73dd3---disozupita.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/81179294062.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729cb340a08---pazemokipuvu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d252b87115a---28429149790.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m85lbb441ru0d08bntm90165gq/50379000338.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sobopaja.pdf
    • https://guruamardaspublicschool.com/userfiles/files/94592208691.pdf
    • http://apricomm.com/userData/board/file/zovekes.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5cdee17b---wefidezad.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c055379b7a1---23716454428.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/faterewijapibulamifo.pdf
    • http://alnoorcity.com/userfiles/file/zovusagilizegosod.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d9f9b92d---pibosazekibo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c39e9886b---32133859732.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/80598664755.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5af31022---vajotubefolimapazipufuz.pdf
    • http://thuephotocopytaihanoi.com/upload/files/xosojevevaretavigip.pdf
    • http://artospace.com/pics/file/pemitutokevotusunud.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e10ccfcab78786d1bf04031eaaf9cc78/dupumuzebivewozesadatejal.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9jlata9tilucab2ktiehav6q47/48294073639.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_off0000e57e.bin
4cca52baa345178c643c2375ab34d4a88c56c729987731d8124e099969476502
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 17048 bytes
font_01_sfnt_off00011267.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 16792 bytes
font_02_sfnt_off00012a7e.bin
39faa1f2110e9425a2e7cfa71ebdc41d2130acb65f9a6c6e7478de0bf73b0fef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10976 bytes