Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc5171f5c824d17…

MALICIOUS

PDF

76.3 KB Created: 2021-09-23 08:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 629ee24cd43eb7afd8c8eabf15d66e01 SHA-1: e47e7c622fa3aec07fcd8d518b04c044b8cf01e8 SHA-256: 7dc5171f5c824d17512d4e60cb6c5a21a3023acf2ddcd5a7fc2b70526c939fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://colegiumaniucarei.ro/ckfinder/userfiles/files/30010023149.pdf In PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/71352081784.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c948de2e434bebff6159791d2d9b0641/wiwelolofarerotepasuvedon.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/35650620705.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357236306b6---71411152682.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/zorolamitekigatidofimubag.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/sewojamusuxivutuv.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lixelabasexileguw.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/mimexopinasudepajo.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kipubaxetapixafiwilapig.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/78914914371.pdfIn PDF document text
    • https://endobible.com/userfiles/file/dopotarozegi.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/kuvaxuwomobosututokawo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/588527569d4552cab691b329e824b710/57325408681.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/5524194379.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/95483454966.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/81361757796.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210919191041.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/33818173890.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/dinojidoxexeromexot.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/panakusipefikavalib.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/8440484827.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/bajazamoxukumimobal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+delete+browsing+history+in+android+phonePDF 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_off0000c769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC769 11000 bytes
SHA-256: 5d156ee7347a28cb1f9f65db140645dd5171ab4fdd5dff7d538040632db105b1
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16520 bytes
SHA-256: 920c443bf42c6fb1e132b04da9a48fd3d7715d54db4f117923c5af8877f7cdb0

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