Malicious PDF — malware analysis report

Static analysis result for SHA-256 4797545e4752485c…

MALICIOUS

PDF

95.4 KB Created: 2021-07-06 17:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 38702c8d4cd402964a174a9959705ed2 SHA-1: 8a911ca1190187b193dff283931942fa3ec7603a SHA-256: 4797545e4752485c8234d25cce8e12d8685072aaa159b2de67e07a119a778baf
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. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting domains. The document body is unreadable, but the presence of numerous links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://heureka-cz.eu/files/dapam.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/80518194400.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/sodaze.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/13f6c7b1618e1770a00f5ec650ba8ece/77579342575.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9e6589e1c660f0468d2fea6dddfb7087/sokefexewuwi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e298ddd0a79---95273636032.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tadojagixezomewawa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/37be1e383408579a88053b9e0910e20d/20036124307.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dofopab.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i14ldcncgk4vqla4ci8inic70h/figekapego.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/1487159709.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/62212805406.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/diweluzuvoxit.pdfIn PDF document text
    • https://norservis.com/files/files/sefarida.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be50ee368f8---gupewej.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/53828659319.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zevepuli.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/62107258068.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/79795194532.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7137ec84---vebaliketidutedu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3r025t0njestg1f35125aedv0t/rumamoronutiwasupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=weird+words+that+start+with+fPDF 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_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10380 bytes
SHA-256: 2e053ccf21eaa376fdc18849fc6db89321a7c62c852be4904c72b42a40f19a52
font_01_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 17892 bytes
SHA-256: 49c7d0719c051eed6c3ec4a49809c523d71b430ad3632cbcddbbf8d1a3a54f45