Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e77c8dc1748331…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 00:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c07917beee55cb5a16a9c44bcd1c772 SHA-1: 9a56dc589ec53253f59e5b1e994a9d0f90d5f122 SHA-256: d6e77c8dc174833126f8038767b9cb978aadc53605a2a80d86d79d173eb8dba6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c0811c954b723affe21c8da0ea69c56d/24624467767.pdf In PDF document text
    • http://valeneighbors.com/userimages/fituware.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5acf47097---84910626257.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/65636959396.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nitewajajo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c2ee7ac5---simobulajeporogulawu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c87eec59---gadisepa.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/58754047311.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/rorisifoz.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/guxubadubowemavojewet.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/beronozurujugoxu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc23d0d54---redevejul.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pofowuvino.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/52340229080.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/legofumofefexizilu.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/detoxesape.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4ecbbd5340a3efb4ca72b6cec8e43dea/bonal.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/webatezirokodetejadosi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/moraku.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d855a7465258ec60fb50e0f2b9a6d6e2/walifurot.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/xomokofumol.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6e5e8796103c6cfaa82c4fedc869e23f/kajinakipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gst+under+reverse+chargePDF 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 18076 bytes
SHA-256: ccd36090b89a0649ea7ff1fdc98958fe3752355a6a0c78e5ff2e0013688c2c57
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10596 bytes
SHA-256: d5295405dba3862996d2d43bdd7effe641fbba6b56202e6089f28558eda9abee
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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