Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6cd468041c2aa3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-24 19:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 11f82bc1da56950b928caa78f4ecc872 SHA-1: 3034941707c6acb474228442e48d2c64a2a519d5 SHA-256: af6cd468041c2aa39399966a880842015283b4c360bf4668683391da42ddc11e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest this file was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a929a12cc1c---posukefobuzubux.pdf In PDF document text
    • https://hiroyoung.com/data/files/59539856752.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d401214ac4---91297216432.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ba1a7eb791ff6f9b72da444297be1d34/66930289147.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45e170237---jusodufolutupepemobafi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e48b7c68e887dc0e7e05a3bd08d8d7b8/65092070812.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042908092814.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/zikad.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d93aa58e08---dovumaginizunu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7108cf7c9090ce41ccaa8ca88260003e/56141769909.pdfIn PDF document text
    • http://tele-video.ru/upload/files/ladajefezitoputenabin.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/04d879gt31vl0s893o235g4ia9/11285053020.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2836d1c79cae52ea8d87de909c92d7ee/51531392883.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826578bdb22---wewulipurunegix.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a54e5af2---sirifaniditefop.pdfIn PDF document text
    • https://kueapem.com/contents//files/vaxofadikedifoguguso.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/1890121188.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a128629f7a1---10635824424.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nurivulavowawidikepipa.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/11669836732.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da56a523e67803b1757b18cb05283001/81237520078.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/82903668872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dream+league+soccer+2015+apk+%2B+obb+dinheiro+infinitoPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/19371691996.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 2060 bytes
SHA-256: 2c0e8e447e688f70c4416c9b2fb7deefd43246c8b2b0a3a7ae7042d8707adbeb
font_01_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 19732 bytes
SHA-256: a500b298d7d9c2440009de48f0555511226790101bfb36e8fb3e60229cbbbb36
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 11828 bytes
SHA-256: 3bd4e437518c4d5d6a704134a55a8fe52726135982bea1e20c40822953329f36
font_03_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1