Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea00dd1816153f5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 19:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d02d24229edd51167518f92d4d3db823 SHA-1: 5c522fa0b3299b0248358ecf2558193636bd3eb3 SHA-256: fea00dd1816153f53ca4c6c9342547c6210e3faa8b226e23d31d0bad09bfe49d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, embedding numerous URLs that point to compromised websites or disposable hosting, likely intended to lure users into downloading malware or falling victim to phishing schemes. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=indian+sleeper+bus+simulator+3d+download+for+free PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/13a62aad6fc10b4e36aceea099b45fe7/72534670904.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/lolajedejinu.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/zejimo.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210918004931.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a747d18ee8---22135172153.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/gijomokipogaje.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/38190232791.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70769648775.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fimosumawopul.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/97938559242.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/kekukegazobixof.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/nefufekinukejuzupeju.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/22322e1530f8ff0d2314d4895d6a22c7/purigivigutiravobokevo.pdfIn PDF document text
    • http://hexindechem.com/upload/files/15991037915.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xenabamos.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/27697107871.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/powuv.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/jabosotofinu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140816306901---60847791037.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57285329904.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/texixubosa.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/virajavirimolabeg.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nuzumo.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wemozanexalekarofaje.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/38406149100.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/pemus.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 18844 bytes
SHA-256: 35e4abe220e0a3848f28f2e9fafa50731402899a01d5eb2af54203fb7807a9ca
font_01_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 11108 bytes
SHA-256: cdcc8c48df105b8d0d047cf7e91dd0ceedc68179a2dc710a58a937bd7e7668e5
font_02_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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