Malicious PDF — malware analysis report

Static analysis result for SHA-256 639c3b5456f7ffc4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 00:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08e37a3308a0d2629ed9332a86d0bfdb SHA-1: 810da9c6e2b317f27c6e894b1bbf395dbd135208 SHA-256: 639c3b5456f7ffc4fc8a344038f0713b0decb9102375fa18f4631591ce260eea
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f9c7b726b177a0ea91de1bb570f723ad/23751782067.pdf In PDF document text
    • https://jmtours.co/aym_image/files/13931024456.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/vafazemoxativufimapu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kodowuze.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da161e7e---retonipep.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/19c9c2020966b2babe70cfa14f2d5524/35275733976.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/74537684671.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/99154357902.pdfIn PDF document text
    • http://zae.me/datafiles/file/bonimobakodagodawezuxudez.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51de6594b2---vojefunodizodojo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b14951af911---ruragafivuzemagobemuxep.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sebitosojev.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/samiwovifawiridir.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/29456765271.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883a186fbd---67666348533.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/89244260628.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784be526aab---21622040350.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/modotezuwebi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/61167455312.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/pugitivevu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/51783960112.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/98315358147.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d9fa7107---titefopepevasonuni.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nq4h5h6lroo1me4hmv89hnklbp/jubito.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/paramur.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc8686908a---sunugezinali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=training+cancellation+email+samplePDF 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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 17376 bytes
SHA-256: b155128e872de6b65b2e7da6350a8c1dd62dab811e00b995be01a8cef7e058e9
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 10680 bytes
SHA-256: 3d40119929b699af35cc5971097a1fc020ba72f45ef3922f4a532964b96a7310

Open this report in the interactive analyzer, or submit your own file for analysis.