Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7ab218a0cad485…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 22:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 755c361ddec6b08a0997e66a7d7a71da SHA-1: c65afa835790245d3e354330ddd1555f15386806 SHA-256: 2b7ab218a0cad48511dc92f6979b4b734012e5b08035b7a6d64490dbc768d3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=disable+factory+reset+android', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=disable+factory+reset+android PDF link annotation
    • https://polenhosting.com/calisma2/files/uploads/6393753670.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/16813634864.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/40988304500.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/26533470682.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/gubozan.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95726802383.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42309076824.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/37375242247.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336b15828b3---40052705706.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161310a6e88b08---40641757703.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/5843370435.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/pelunupugigonuxop.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/64365149759.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130131722b60---jofakarivobi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd1d6539fd---jokasebunuval.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/42039902011.pdfIn PDF document text
    • https://mackbeks.com/files/file/gegidanidogijexukubomafu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/42269612470.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/33223323566.pdfIn PDF document text
    • https://swiz.eu/files/editor/nulojazivizup.pdfIn PDF document text
    • https://reha.bg/content/upload/file/87683050847.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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 15420 bytes
SHA-256: af009d5a9dfb9b501f8e233d305789f74ca3ec246ed1703333014413fa60a09b
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10724 bytes
SHA-256: e5f213282d5f8015a82146786867e70316057901d5910f8bd1621870ebb28a38