Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba44045bb04faf…

MALICIOUS

PDF

69.1 KB Created: 2021-06-19 19:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fa8a152daebf410dbf9ddd9c6f6b4097 SHA-1: 1e0063e9a29b89ff206cce70b8f8b6c6ac0fdc93 SHA-256: a4ba44045bb04faf907426d97cab8cb5b1c7373bdce6ce45efbc64c6008e426c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and a deceptive download button, suggesting an attempt to trick the user into downloading a malicious payload. While no scripts were explicitly extracted, the PDF structure and linked URLs indicate a phishing or malware distribution attempt.

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 https://inwebjor.ru/uplcv?utm_term=abbas+imunologia+7+edi%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7177ae4f7---35006756845.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kobotipavavuzimu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608154a70a657---dukikusufenokek.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fa5044bd---44602972672.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dcdab220---96113145242.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/79d94a1190ec345fabc02fbbd5cc7df8/71578078777.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/91095062882.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e7c7ee4bcb490254b08e0f2286e0fca1/81278788854.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/01c58dc9c4022cf578e8b7b6d675a6dd/92360358677.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094de37a60cf---94314826181.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6hv6i6p9rmrhh7d0shhqfbs40k/vuxit.pdfIn PDF document text
    • https://giustofiori.it/file/gesaxetifikutikipov.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6cfae29dbf1a071eb0725281f4391cfc/dimefukukujupulo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e753c333---27635410098.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/bedofutifudazurigabulu.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/76760707214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD01 5776 bytes
SHA-256: 5e72a2bbba7a1596570aa8be5289c951a89bda03a41319ce838914f1e6561a12
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 13020 bytes
SHA-256: fa8117a4ea0e2047a279b9fe3a526ec1ae979e6b7c32891fb5ab9a97b6f306f4
font_02_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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