Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99577d1e1101d19…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 16:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e709cf783a7265c50cf2795225ee62 SHA-1: 8c5b2db11a19ab348727fb86b26f87dce5f253c1 SHA-256: f99577d1e1101d194df1e7f013bd426205c900d6ae5e0bb6b7a5c4007ded1716
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to various domains. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a pattern of using disposable or compromised hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=flv+players+for+android PDF link annotation
    • https://sibconsulting.com/contents/files/pamaxo.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/99552903050.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/raliperiwasazepowikuw.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/vutanezujisazulupulewa.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/86861568351.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/70733882714.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/57897020633.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/99960190596.pdfIn PDF document text
    • https://geniodelweb.com/file/60221938344.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pitolaturujupetesipojolas.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/batesuwezasinupapoxirowol.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2ni7dil1souuvtttj5m7pm6uhj/marazijerigogus.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/39984845105.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136542ab0120---ziwutalenubelilepikewe.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/46872125309.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nineguj.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/sezutorixijiwaboxog.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/soketoxadudimoweturizi.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/50106938313.pdfIn PDF document text
    • http://dytac.hk/userfiles/lusedu.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/xazuzovati.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/toxize.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/78677497653.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a56a77096a8cd4851810f3476f9e540/nuxorilozemanubugomemod.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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 18804 bytes
SHA-256: 7fbd17bd72d958c45ad0d42e68e3f0f36718988b0ba159c2ab84b56ec92754be
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 10552 bytes
SHA-256: 7fefab853293b960858ddec02dc041cbe37db95f7d5c889f7d18ac1382334b1d

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