Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac14f08e03435381…

MALICIOUS

PDF

77.0 KB Created: 2021-06-20 10:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a2b969daf32e269f56f1f1ee44703c5b SHA-1: a6cb9ac54cec23311a71fc382ab5a0b17f7a79e1 SHA-256: ac14f08e03435381e56c8fcf29a4c330574cf3b0e02b1cdb4442ee6b320b23a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The presence of a 'download button' heuristic suggests a lure to download a secondary payload. Although no scripts were directly extracted, the nature of the heuristics and the detection names indicate a likely intent to deliver malware via a downloaded file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://altinay-law.com/images/file/bibawilaju.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c01f9046a---40493569540.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jogot.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f40ea31d---sutulusapodimab.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b4j8hbrnf31omsu9dne4reb5mt/soridir.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8auij9729unn0bpdcb9gqeqglj/somavodi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d66d7e6e26cb9d1c6da7821b6b5cd788/mabujusunuka.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/80a5fd04f0d2c6d5d4febee7a409ca19/69640352590.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/lon9offp8r8pnremj5628i3uo7/61037029227.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160926bb767793---kovep.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hu6g86gqt9oh3fsn06pk3es4he/71681752319.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/palixevi.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/74364162343.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/3228890586.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606e537bea85a---nepuki.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/12013193411.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kopasebuxukujid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=les+gold+pawnPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 5064 bytes
SHA-256: aad41156d2fbf3ecd048ef981e7db661436cb761510c4bac6884e0a0e6bad987
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 11772 bytes
SHA-256: 9a5a28513cd2c9099e8ceb33c791b84c23d8b7ad338aa8edb885aa7a76f87f03

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