Malicious PDF — malware analysis report

Static analysis result for SHA-256 272e60a4e703dad3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 12:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85517422d11b8d8db54dee4116eb6c76 SHA-1: 290f487d62ddc2ac55c51409d086ee623eaf7297 SHA-256: 272e60a4e703dad3ee282edc0be525c7949b0f196fb404e04f18abe0038ab29e
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=compress+pdf+on+mac PDF link annotation
    • http://digitalqwerty.com/ckfinder/userfiles/files/86006858434.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/jajagek.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6aea7d8c80c7ad128aef89b9be71150a/48990883974.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ba04db4e9d7c02fb7af99106c09bf4fa/10499796848.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xopupesufebixodevez.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/dekedexidanudajisus.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210721213508.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/midifavuxesup.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/17084438831.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/divovewifuranimanezodi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0tp6o614uhnam2h9plb4fpr6t8/16932841954.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/nadubazan.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/79708112921.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4de842d76---fomoputatutupa.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174f17f5fc---nozuwaxur.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/sivunakame.pdfIn PDF document text
    • http://www.polni.si/Images/files/fanomevonisedawaz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rki97igmfc6v504fgist9skou6/wewadazogekoxodabonege.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/59641118595.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dpai9tigfn0sm2q7bbqpa17tfj/xasikidal.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/35079577986.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bf8af8d1---pegovofegosasurexi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fenoni.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a989ed8246f4e4e5fa5232dd451a13b4/xinilivegima.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10576 bytes
SHA-256: 2773c8ec626f694c66663b8f003024c3eb96fcccc69789426f7eb3532d40bffb
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 22632 bytes
SHA-256: 1e794703e4245b41dd5146c9de9f2a0c456f5b1ccced1c5bc6ca10db27adff58

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