Malicious PDF — malware analysis report

Static analysis result for SHA-256 536e2398bad6e44e…

MALICIOUS

PDF

103.0 KB Created: 2021-08-19 10:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61feedf59516c3802603287269bd2225 SHA-1: c6028f80284e8e2783a79b3cc9e3aede07416ac3 SHA-256: 536e2398bad6e44e0b7679bfb35bf4e9657a1c43782c876998f4b9e4d8fc1bf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/53526a471cc1eb94315441921f65246b/dusilovosesutemexi.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/64351510060.pdfIn PDF document text
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/98121153618.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c354e90989---firomufopadogiku.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lanalizejoku.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jenaku.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/54747251995.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/zipewokegometise.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/solejiwenixowataxasitexet.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609342d014987---23228492526.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/56742493402.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kba9jljalqqnivfr70h68kuiq1/vosigasi.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sifodakekuzo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa46c8dde0---39967681256.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/i5o73po9nj99pp81nv4n7geivo/miraxiwejedavuguz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dde90c8f83fca450d8d9c496560547fc/69944469772.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k2139ge057fmesbf127h3ngit6/pudujewukox.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1fd01af06---26193285276.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5ac71a46da176768200d5ca330b0cb7a/84925793383.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/85856746900.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/fovelexigamosagi.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jogawibud.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/551d56c52b9dfc860f23b896f4573598/73587728999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=christian+theology+by+millard+j.+erickson+pdf+part+2PDF link annotation
    • 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_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 11760 bytes
SHA-256: 22e95f7eeb6daaa833a000c49113b38d70f1d4b9c6495453162a78c1cefb2482
font_01_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 16380 bytes
SHA-256: e0d3e2c9f5c6141ec99b9e8be82d948d53f0f8193c89f78306eea2d6bb1899f7
font_02_sfnt_off000175f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1