Malicious PDF — malware analysis report

Static analysis result for SHA-256 0090faed2e8eef9a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 05:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0536dd573acce37e17367e8e13355431 SHA-1: 2c7326ac3093258dc53e47265d8dad6cafc8b24d SHA-256: 0090faed2e8eef9a5fc6efe197a2a2ab5ec07db7ea5ff40e2cbbb0476e90fb3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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=c+programming+question+bank PDF link annotation
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/99089658514.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cc6758198fa45924f07cd13b564aad8a/jirikivemidifuvofon.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/kopuserapug.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/67601094863.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/47588139346.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dcee3cbc---bozexeje.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///badepuweti.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a53656aad6a0f6522ff8191ee0da1672/48113978654.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/navowu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d26d019f9---debiwudemegifuzazupevul.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071526c05907---91617950434.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210806194531.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82794403752.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/28454323217.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/87455175256.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/jivemirabomob.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/4196768087.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d5b1773b---75165098733.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/zusuvikegofapeparane.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d14801e7---92631882304.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/33492073999.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/50270268683.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/loxovumigazamusirufax.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8edc204c93b669986850c69e866b5526/rufodufula.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 11060 bytes
SHA-256: 8cdd072fb1d062db98432aa3ab912d778bdd3493633f84d8525b229c504bd097
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 17736 bytes
SHA-256: 9e3500fe481c7152cc25bde0d1ed82f3304b3b62dccf9191efb737a9bcacec98
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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