Malicious PDF — malware analysis report

Static analysis result for SHA-256 8389440487e8e850…

MALICIOUS

PDF

181.3 KB Created: 2021-06-27 01:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 913bf8bb0b6c0d9ebfacbd7c9ddd3ea7 SHA-1: 285fb2ac9e5ee70bfd4c32ae3d24b1be0da30659 SHA-256: 8389440487e8e85066d77e2de1924c4df3797977b7a55544c34eecf2d3b68407
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the ML classification strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://medvor.ru/uplcv?utm_term=the+peace+of+god+which
    • http://hytechplus.com/userfiles/file/28570725438.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1da48c9ff---jofulenukutavosar.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9358899836c6f66b74bb1df6c83951f0/tabej.pdf
    • http://dade666.com/userfiles/202106file/2021061502303770554.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/910a4btk9tri9u7nuo2ovgnb40/85661229726.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2cb644e346dc3fe67433fb7e2e8565fa/luzoj.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5qa3la9pick4rea01f7i6drmvp/gosemawuzomerexoku.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/eb6d97af0b15c936114c1713c7a2ded4/xinadifiwedubezakoku.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/59253a02121936d6815275c5f1afe434/fofapasuladigesal.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ajekpdsruu7dh4l6a9gm2rsdqt/49998543970.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d8115873fd1604405ffc9a8a9539e347/wajumararilel.pdf
    • http://pphu-joanna.pl/fckpliki/file/vebezalofopanakulu.pdf
    • https://vsetinrally.cz/userfiles/file/foxijin.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54ab15062---9671563811.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b918602920deb6b1be20025f2e358c9b/nitulakadixererob.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/16188190990.pdf
    • http://fittbike.hu/files/file/wabefafekipuvid.pdf
    • http://fullx.net/files/75662429816.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/pobukegipaxitoke.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7553f87b2b376e9ff9e05e942d8c9e66/97175343425.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2256d9b597---83274961163.pdf
    • http://rideabikenews.com/user_img/files/57175306736.pdf
    • http://st-communications.com/ckfinder/userfiles/files/9730661424.pdf
    • http://davidhammerstein.org/userfiles/file/88237394578.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_off000254ea.bin
51b3a424e2ec4a40094691e7ffef460302c55ce0fc52faf8c901dca61c864319
pdf-font-stream PDF embedded font (sfnt) at offset 0x254EA 10432 bytes
font_01_sfnt_off00026c92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26C92 16792 bytes
font_02_sfnt_off000284a4.bin
27565c3157868cbf5877ecff8b45833b2757a83cb3538af9369f1a28845dd64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x284A4 30252 bytes