Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4e0e8b8402b5f4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 14:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bd4e03478138b0a87600a77b6ce84d8 SHA-1: e60db0e40748477f0d7aaccb3bf8dfc10b979595 SHA-256: 0c4e0e8b8402b5f442a8889cd004e656d561068e2c72d03a9b374e413582147c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and a link farm heuristic confirms the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://zulapin.com/calisma2/files/uploads/zuzoguz.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/37816892975.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/83389676276.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/28673117541.pdfIn PDF document text
    • http://espokebar.com/uploads/files/59348982133.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b231e8498b2---79834196678.pdfIn PDF document text
    • http://axwelindia.com/uploads/viruvarojuporan.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9646a3cde4390964eb02fe64a4581757/17379438079.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/19420604648.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24360028221.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sps0bn476gun9863tl31i6q60e/finisisepazu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a152a299a76---dopuwivodigewivojazu.pdfIn PDF document text
    • https://penal-garazh.ru/files/wiwofavag.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/19ba495ce743b8adfadaf92b3a8cb832/gowujuwode.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///37679409356.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/rimipemixafij.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56183106890.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0c316cd7---navowujimilugi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f2cbb8b767ecf58240991dbb92a262fa/70238923997.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc82cf63142---manaxanafan.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/bumevofinokisunuropefap.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/fomogepujujofofogobemeri.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e103d117a438c9a46db9646dc2303d90/xijufakeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=perfumes+the+a-z+guide+pdf+downloadPDF 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_off0000c137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 11228 bytes
SHA-256: 5a643e86ac6f02b0126b4d095daaf4b2e3ef02f56d9e759be3890f9e1f63d0b1
font_02_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 16724 bytes
SHA-256: 8a5fc2150f0e17959ef2e53429d0aacfecd9b8d0d029a4fe7385a1b444155878