Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09b4ca74042dc4a…

MALICIOUS

PDF

79.4 KB Created: 2021-06-29 01:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f82d5c307e91dab81b9e0c345758c70 SHA-1: 8d5bd335c4aece77ff19c0a6387e34e36e097294 SHA-256: d09b4ca74042dc4a89c63fcc7e0b660d3852ac1b327397fda46a0bbcabd33619
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or direct them to malicious content. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16091c29b69d74---70456731951.pdf
    • https://tlproduct.com/userfiles/file/lolotoj.pdf
    • https://ancoraeducacion.com/images/wepowezal.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/83024696832.pdf
    • http://ahcxdq.com/uploads/file/280432219627.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rgujqn2ivmajnsdob93dsmbpq5/koduxegivavugife.pdf
    • http://nedirajtebosnu.net/userfiles/file/bujopazufifinuzufamuvuw.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i5vf70vsp5hpupiafd63jsr7bm/39712851613.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeb187085---puropugezaginad.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d7119669585f5ff4d69a0e91ea8bd7ae/82089147707.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5a3e600d---pavobilu.pdf
    • http://ahsaipu.com/v15/Upload/file/2021430141571533.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9c401e3c---wenoruzu.pdf
    • https://przyklejki.pl/userfiles/gapirudaniponepawul.pdf
    • http://andrelandberg.com/userfiles/file/zufapevibuzijedajamama.pdf
    • https://watertorens.nl/userfiles/file/72842996243.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd765bcf80---33834499034.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d4395c1a9b18553005342d479a4c7e09/18919636520.pdf
    • http://sakuragiramenandsushi.com/uploads/files/7805396111.pdf
    • https://usssecuritate.ro/userfiles/file/9527650957.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7fae2a3f3460726de8aef5aea3ea7033/69706949858.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2vbtqrcn176c9bvhonqt3nmkls/kogapobuwusekuvugolobob.pdf
    • http://alexlunacoach.com/img/editor/file/xefob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=uncharted+3+ps3+iso
    • 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_off0000d2e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 16792 bytes
font_01_sfnt_off0000eafa.bin
9e187e9fcab9b3ed68ecf4276ffb360a487eea515ad387a80702216162554392
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 17208 bytes
font_02_sfnt_off000117da.bin
f076ca9177f0818db187ad1f2a315534b4f0a0537244635b039c32a86b85e8f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 10744 bytes