Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e78a2991dd29922…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 08:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef6c868433c8bee3b10dd8c4e268877e SHA-1: d94d9d762d8b13664c13d5af00e0ef7963e00d16 SHA-256: 9e78a2991dd29922cbe3d5b8f155bf6c0a0b88089f66c112fe6514437f1437f9
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised websites and disposable domains, likely to trick users into downloading malware. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://istanbulbalbir.com/upload/ckfinder/files/fafalez.pdf In PDF document text
    • https://clubon.top/uploads/files/pejumuk.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/88098455476.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/fezozerazi.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/rutajedimikigirejavuduj.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/71151465697.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/jefogajamowuzozanu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lapexon.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wiwoj.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/tozimiwifawalobunomol.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a081d703---34284680243.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9667859990.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fuxotupasexofevibofaluxox.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iugsdcb9b9gug8atgl76fd82cn/60133178898.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/somixejodorakuvorekavesi.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/pekozaf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613485cb4f096---1539296453.pdfIn PDF document text
    • http://thepducphat.com/upload/files/misid.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/97432746197.pdfIn PDF document text
    • http://agmapure.com/upload/files/bigozuf.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/bakufaguvopuraruraleguri.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/fopurigudunivu.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/965079853.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/99223622177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=google+chrome+apk+free+download+for+pcPDF 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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 17024 bytes
SHA-256: 64014f25c8aded1647d0a456a92e0884543fb3c7c5bb70efba4f956ef165271e
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 10928 bytes
SHA-256: 846c9f79b2cb7515f26c09ea222e8198bff337ecdcb66b3634b22ad664832e8b

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