Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a10abbdb9d131bd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e42c0204e835902d0e9326adfb8dd49b SHA-1: 79e38aac546935b0052640a8a7423f69a41eaee1 SHA-256: 0a10abbdb9d131bdc420b59343a2e668683248b6c7fa9af97606113b37e6bde1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=android+7+screen+recorder PDF link annotation
    • http://compsult.net/userfiles/file/14487641400.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/81217222199.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/vebepikiwudogakado.pdfIn PDF document text
    • http://ore-processing.ru/d/files/rasel.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/sipiwigugofa.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90646778571.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jutiberebenanaj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zekakujiwaliluxag.pdfIn PDF document text
    • http://techmechengineers.com/uploads/lovidepojidifozalesi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210918070726_1681005519.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/36764689474.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/64066324860.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373705b3204---lagewiwapu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/96152186916.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/12674083113.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3b3b1b86bad7994e3d0416804a33131c/fedoku.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/mabulajora.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/26860452870.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/xunidadiladipuvevevaredo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/d8hvpfrqeeq1666n34ho7bk6gi/xekikogupixijok.pdfIn PDF document text
    • http://handgun.ee/media/file/22297673505.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe2080de0---97312762852.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/deverikolijipebugi.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/84949687659.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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 10088 bytes
SHA-256: 0c63fd7421d68637c91944c7ff2acbf126942a3728f61f1b71fd0cbe5091013c
font_02_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 17796 bytes
SHA-256: 5a416f666bd6a5abb7f8dbc90553e66f7d2033378fbea76dcde11a542036f904

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