Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f842f2ef181d74f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 07:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a302d4bce1776851a0ab96f01dc5813 SHA-1: 976a5111ce63917c0ceff5770446afce3243ce64 SHA-256: 5f842f2ef181d74ffc862a77a978bd4e12a9515e21a5261fd226c2122e9206a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking, likely to a malicious site. Multiple URLs were extracted, pointing to various compromised domains and disposable hosting, suggesting a broad phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=socks5+for+android PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613948523f1f6---xudugiwogenaro.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/somodakakazu.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/55850203009.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/38245388576.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/96342735783.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0b64ed61---53402040937.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/43925188167.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/92073343098.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/32093496094.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nemozepi.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/mogamosufiridukufa.pdfIn PDF document text
    • http://dhf-china.com/d/files/ralokatuvarewap.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/66237440871.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/jozovalurigapodobu.pdfIn PDF document text
    • https://bloc-immo.com/images/27452833696.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/wiparamodis.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/30076825700.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_6C7E9A0C4A08495F.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/xowivakujupi.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/92488091339.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e1611462---zibelasuzu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/titegize.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/54573602868.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/31169914222.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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 10496 bytes
SHA-256: 98165978329155d95cbb5167634ebd9e4b6c862c548dc8b23ed5a2f9ed8e8edc
font_01_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 14128 bytes
SHA-256: 3621bd70bc0e65073d51550f399b3dae10cedf0d3e8e5bc86bf4cea73be06a3d