Malicious PDF — malware analysis report

Static analysis result for SHA-256 314b52307b712499…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 10:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b73bf9e133065c83909872260741f28 SHA-1: cbb3a1effaee75f1f91216b5355193b3954f67cd SHA-256: 314b52307b712499d8520132263bd67d8d5de3fc14bc6584e5cfe07eda3b6ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fa2ecfafc8419fb7b57f90305b692964/7952364944.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad77146d66---jumugonuwa.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d0390ec7912768c4d74e05c1b666d90b/wikiga.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e90474d05---jopesipezadeboloraduv.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e68d1bc1---37363928029.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0352cfa2cfc378a72c78e20b19bebb7b/valozifixu.pdf
    • http://servis-hradec.cz/files/file/rozimozulizozasupazuvan.pdf
    • http://accessprecision.com/userfiles/file/67119675.pdf
    • http://ciarajewellery.com/editor_upload/file/29345882783.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dhflui74dapmmmnamvna1imahj/kolanimopigavarewem.pdf
    • http://aristosaigonhotel.vn/uploads/files/61497813904.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af19d47b152---87809259752.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/dcfb4f6fe5343928cc1fde3432072e6f/vopivonawelolasafomepa.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f29944aa---letixas.pdf
    • https://accuratesearch.com/userfiles/file/towetojizazuzekefupiji.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02d53249---rusofarivipoxesasa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdd521e03---50361437805.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7b0f7ce751e0b91da88512f0196d9a5/90224450155.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/366281c07c2f9336a4a837bd28915827/lajefesamazarasajawe.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4c512d3a---miwojejajetuduzi.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085179473bc9---tagototokibimap.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8162025368---nejidekipurulu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f8d8e157---47725745452.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=about+harriet+tubman
    • 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_off0000ed13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16792 bytes
font_01_sfnt_off00010525.bin
5ecf68b200561383c3804c67cd868f7b9ee9e8e6d89bf2eb8ad77b2767a9f033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 17204 bytes
font_02_sfnt_off0001321c.bin
791828b0d754b01b89edc92565f3d4c5cdd8d126b342650accecb8a9d64548d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 10380 bytes

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