Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7698d9f3fabb0b0…

MALICIOUS

PDF

136.0 KB Created: 2021-09-15 17:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58fbe917c59c4ba77b2f113faf563c13 SHA-1: 19d1310026370110ced6f0c583460baf8bc18bed SHA-256: c7698d9f3fabb0b0ec39cd92518aada404958482cd17f17ab7dbec3a5fd8a70a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://archism.ru/uplcv?utm_term=havoc+rom+download PDF link annotation
    • http://immobilieninvestors.com/userfiles/file/75428451126.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jisalena.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/97530745626.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b505c7c---nazisexow.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/vabefige.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/miropuk.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/156203440.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kafupesimuwiruruw.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/45bebd9e7d5f3559d3da36d2f0f6d80f/81037912438.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/rumoviguzaru.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/4627190285.pdfIn PDF document text
    • https://somogyplusz.hu/files/54795216879.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/pugejawuvikizinijixuvamas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bf26a8d8---vagusexivenotet.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/rivukidalat.pdfIn PDF document text
    • https://carlojans.com/cms/file/zilivi.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/xaxisupakege.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/vakijoxele.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/62586000627.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jixalekifixupakaxanokuk.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9144e82f1466544ef4a090bace65c81a/53477824159.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/74377514208.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/milunigeduba.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/gogusiruwuwe.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_off0001ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD02 20656 bytes
SHA-256: 1103f95baf1053aba39f2acc0813d34a88a794219e20fe45b04c3bf34f73c56a
font_01_sfnt_off0001e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBCC 10184 bytes
SHA-256: e22182ff79042f62e24054b8fd7a833b39a8587a90291b2deb7d8e68cab48ab1

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