Malicious PDF — malware analysis report

Static analysis result for SHA-256 325e6f506d5c59e4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19e10b1bdc57e6be7be2e20d2ec9c380 SHA-1: 38a8d087b4839c4587ccf17c4b02baef24064faf SHA-256: 325e6f506d5c59e43c624705a7784ad077e70f824df9e463b9c5a3ecb52a068a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, forming a link farm. These elements strongly suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 https://nomylo.ru/uplcv?utm_term=a%2B+hardware+book+pdf+free+download PDF link annotation
    • http://aven.su/userfiles/file/mukibebibefisag.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609577d4eab9a---mikeza.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zevunalatebifafovokufa.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/virulajomegot.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/wevut.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/71860108851.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/71678705812.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/vubuwarixe.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5c3ce55cdfe1658d9b63ceb4f29772ea/85958995625.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e687bc79a63---xamikebijitobeneve.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/67910630713.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7eccecac934da2197c754e65183d0596/buwuved.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///wogabegitezalamudo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/magilumizufepidorataperuj.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/minovenibevudozarifezif.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/faforije.pdfIn PDF document text
    • https://umartravel.com/files/27668329145.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe24396a26---76643985163.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/zajopefepiwemimote.pdfIn PDF document text
    • http://ibb-online.ru/f/file/99655103737.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/basubebuwekamugiwaroja.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 17032 bytes
SHA-256: bb2e0761bc8a4277857bed4d864d2e42a11d63a9b0d614c001211aad46cf8789
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10536 bytes
SHA-256: 7bf288a498e010082a8083c30c91f7cb809b1d8eeb4e707618f267d7253c8266
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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