Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e868dfd6b4035f…

MALICIOUS

PDF

91.1 KB Created: 2021-07-15 09:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f96d377ea81465d05ce4b997022cbc15 SHA-1: 927b5f1716804de7662b02ce0b02a5dc36a2425d SHA-256: e8e868dfd6b4035ffbf34b420ce48fc01da884022195d216f241fb0d44998bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose, but the presence of multiple compromised upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://huntic.ru/uplcv?utm_term=consumer+equilibrium+using+indifference+curve+approach PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad318b0e8---ruxuwid.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb091ba5b0---79446703337.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/92bec9e120f7eca9487ddd2cde0ef2ed/sotilorujeje.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/zudizodud.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/61045052643.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210714153145107.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/binazokimepeg.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a4c1c843---datugafoguvos.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lazun.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/491788aa70f93a2158d83a03d1a919e9/58720599731.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607126af6ceff---54836013008.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4r4gfj4qla4pkuf5f2eg2h5k7q/30075291711.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/sekebani.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4hkpu823vq7d55sq2vnb2mvtso/38092690718.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fbf2c47e1---64002386600.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c3ocbml209gpergbhqc7m1l096/bivajox.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210516113731.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/783036bed66f9d0891bfccfd810bfed4/20365195955.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pv64a5eji7ep07s6bceu2o8hhb/46048886111.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940281a7e3f---rusixot.pdfIn PDF document text
    • https://lemanssrl.it/file/67441272966.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9367ccb3d4726e4e2e1729f7d32ebb4f/sorefikato.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9f71a5b1---12314584556.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/wekinukilezaloz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac897e9c1e---74748485641.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072580ee1a78---38011525734.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/duvozorixawusuraroduzagev.pdfIn PDF document text
    • http://hydrem.ru/images/file/bilalatinenavawidunar.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 17688 bytes
SHA-256: 7612e0b1862615b08d5945f8a0eb17e3b4e5896fba694055d004cba8772357ff
font_02_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 11452 bytes
SHA-256: 59573dac3797b4b333640a88f6d478d23085b2e6d96a98c68500dc5c891eb5cc

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