Malicious PDF — malware analysis report

Static analysis result for SHA-256 108562a62199c573…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 493427755c30fdac68373d6bdce69f6e SHA-1: 22c9176c8c78ce0eddc860c5e7dc8e5776c033df SHA-256: 108562a62199c573828527f1465bb48b2986deb49913a3921df1bc4c7d04dcae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=showbox+android+review PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/1775816399.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xagapixubalaxegix.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131506a3e469---jojiboteriwobideruwu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70691391305.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/43795277810.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/22248673564.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/84373276028.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/favugitiwe.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vakinoziwivugikuwuw.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/6730745585.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/87464341230.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/bivevamisowewi.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/11761730998.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/98698973012.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/88689060355.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/08c09ee6f21d674fadca681f30f49978/99891577889.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/lopuli.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/99897071165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23031f60c---jujejibowonamokuniw.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/55680235115.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/wovumizuzujokozaximuke.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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 20504 bytes
SHA-256: b018cfaded84a461fb4db7e96766ae1ab9f310dece0d12eb6fed660bac0e0a44
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10500 bytes
SHA-256: fea65d3b7b1bd882578d3730d2bc6c21578fa9556abc34784e70af75b736765b
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1