Malicious PDF — malware analysis report

Static analysis result for SHA-256 2842ac30b317ea96…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b43e6acbc0e00fb737cc7ce7bdc40ef SHA-1: 96b5629c227949eb574b59756ca699647e32c4a2 SHA-256: 2842ac30b317ea96156a4c6a088048dc3ee321809c7bce8c93ba4e8157779348
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to manipulate search engine results or host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://silmalogistics.com/sitename/app/webroot/uploads/ckuploads/files/fetewuve.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/bbac559f6f29e6026897a14405597148/xavikiwugeli.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/75935336645.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44607922911.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/28549506712.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fetex.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2ec735e8c7065a57c597248a96f85a10/losifaser.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/55642026398.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/7714951832.pdfIn PDF document text
    • https://kartplast.com/resimler/files/58154566943.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ea4ddf4---76736451374.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/24469807090.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/df47637670e67cabd29bc537ff63d9f3/77242398470.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da92818b73f---39297785646.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nibowutabefos.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sisajodesonexewexerela.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/81253985691.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5776584bf4b8704ec47d5a9a3d7d331d/melosamitujoveguremapuf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b88513b3ae7f32cc8267728c1e979b12/30776904568.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160943d638c8e0---kopixirapibixabezavuket.pdfIn PDF document text
    • https://xistenze.com/files/files/rifubod.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/lisofafapi.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/3769442062.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/73356437604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wireless+sensor+networks+in+iot+pdfPDF 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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10500 bytes
SHA-256: d0e5060d4ff182502f40258a81eedf6eac9a90ce17ed803d3888d50b13dc7c30
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 17120 bytes
SHA-256: 516bc3bb60b596b7b76646b656a26f42a8eb3c149e5c00b71d07610e346f7938
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1