Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3a1e0b68e07378…

MALICIOUS

PDF

69.3 KB Created: 2021-09-22 15:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cc6ad61a4df2c917c381f35a772663e SHA-1: 7f910d1f83f3939d89b5ff28e89fded46f3b0104 SHA-256: 9e3a1e0b68e0737832054b3271a2efce2fd8fde0596208e2220471cf5cfb9f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=cara+blokir+sms+android PDF link annotation
    • http://hai-bi.com/uploads/files/202109020817331696.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4995523688.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904131941425247glvmng4793ea.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ken5l5fnl43kfqodlukugtinr4/5945712036.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/j8l1kssfsb9348voa1fr83o6nb/vovulemu.pdfIn PDF document text
    • https://sergiomauri.com/images/file/99617644182.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/66780039205.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/soxumuputidori.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/bogogevugasukod.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/98233128353.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/76257894227.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/dimepotetefegatijafu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e637b516---4913524130.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/30586570723.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/80700534074.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-9/20210909205314153097.pdfIn PDF document text
    • http://plise.org/userfiles/file/16460323246.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a21f0316e---36670144170.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904171426.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/rovevogekanuvudemixuxezeg.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/60559764264.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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 10444 bytes
SHA-256: f2ec4aa0b6874eccb1dffa6f1a0e564927accf4a372b48398c00e668a6ef269f
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 14944 bytes
SHA-256: 15eb50ab17e6991992f8a0defe1f1d648374841b3fd73a85215d5cda8ee6e594