Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5aaa9a72bbfd3d…

MALICIOUS

PDF

80.0 KB Created: 2021-10-10 22:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12c52b4a060a26e18459c4e1b8e03378 SHA-1: 99d111311f115694863bbba910071ce40a84e71c SHA-256: ec5aaa9a72bbfd3dac5bb7f4ba4a903119123aa0c6ec238177e8463b55ea2100
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to manipulate search engine results, a common tactic in phishing campaigns. While no scripts were directly extracted, the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sziszolg.hu/editor_up/sowip.pdf In PDF document text
    • https://davnosti.ru/upload/36551148263.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/49762409822.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16163332d45627---42047087386.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jutejatoxif.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/leverogew.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/13112464513.pdfIn PDF document text
    • http://retailcop.ca/files/4553738071.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/23945531089.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/66079495918.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/vifukutakovob.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/mejesadiludir.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/tafidezafemofisija.pdfIn PDF document text
    • http://intertravel.hu/_user/file/jewelitalananefudawap.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/42607860932.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210916_69D3FB945F7E8F2E.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16150811e72de2---6249066074.pdfIn PDF document text
    • http://scantech3d.com/files/timatibejimeroni.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11220554322.pdfIn PDF document text
    • http://cnfgl.netsociality.com/upload/files/kavufamovodabujofike.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/bepozomu.pdfPDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614539c620b43---gozamapegogadof.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/402436946.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/58501744977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=abdominal+perineal+resection+post+operative+carePDF link annotation
    • 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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 19044 bytes
SHA-256: a4bf3b698d248ed56ebe3290806efe989d4bcb9df0e6626346396338034db2c9
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10864 bytes
SHA-256: ea876ea7bf1511286f7924258e4f765ec6f14fa28681523f1549ae8cf5f599c8
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1