Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c59cf9c54408a6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 10:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57fa1d3b5fbf6252da68e9226285a295 SHA-1: bce1798ae39f6fa70c6d56d7bb6b8d454bbccb37 SHA-256: 48c59cf9c54408a65397297b1c085840473270ade1d86d591e0cf723b97e227c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://aapltd.net/userfiles/file/97498808173.pdf In PDF document text
    • https://faktxeber.com/resimler/files/bonidaxafesedadevefutuxif.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/nuvedifanibug.pdfIn PDF document text
    • http://gewald.ru/content/Files/69093792222.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/gufef.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/88102353672.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/db434bee637cd24b53fc82301409db18/kojol.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/12454057931.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140027060112---96661221150.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/636bb4a5821cb97faeff7b7658953080/11229706711.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2m7vpf7v9t6fjbq177kipng81j/91044329791.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_2140ABA655E34DBC.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/gobomugajemak.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2747381679.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/47185133055.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/93670947695.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/38606751196.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/72376449305.pdfIn PDF document text
    • http://kaies.net/upfiles/2109121849211373823tl1tr.pdfIn PDF document text
    • http://bienbao.net/uploads/files/83761154004.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wejogivixexa.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/13258902880.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7b79e29f---93657070334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+safe+browserPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/manidurekawijosapojedav.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_off0000c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 10412 bytes
SHA-256: a6e71440c86f566c3be518b4102fa2fb2aa34bea73465f6365554a9ff435f18e
font_01_sfnt_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 18584 bytes
SHA-256: d89a76ac96cea198f7ead85fe364822a04e46efdb05ade1cd39c1674cfc6b2d3