Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76b6b5618b4bc3f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 00:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6421865b462b783ead1da66c2101ddf8 SHA-1: b46be01c8e6365af72bd4473d4bb043d9b9d6922 SHA-256: e76b6b5618b4bc3fdfd810090bb81ab7d4514d9eb01d13b3fb192714cb7394d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, with several pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://brandiassociati.it/userfiles/file/deromufeb.pdf In PDF document text
    • https://gencerenerji.com/resimler/files/63010507317.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/44712629679.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/85807686605.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/2345942068.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/649553614.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ad96e69c6e5d42bb93dafde199c564e2/19893062437.pdfIn PDF document text
    • https://ibericadearmerias.com/file/mibifutudakoluja.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/renegekegadad.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/xamodexadiretifetite.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/zoxikonesesarudevet.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/lonigaworetuserekumal.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/57573607039.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/buropuletitetutamalebef.pdfIn PDF document text
    • http://accronline.com/userfiles/file/rowolisuzitupumijemu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/73537257745.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31480904948.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/zotopufiritudusegunorilu.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/sifabaxulilul.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/amh0lmcafvbqgds1gtfe2jaf96/51286922554.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/netesaxedomaxeno.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/87043198658.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/86559363859.pdfIn PDF document text
    • https://hobbypet.cz/files/file/83509338558.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecd22c48c---dasarubidukevixafap.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7f796ec6---lenobibuvovizelejenubaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+lock+focus+on+android+cameraPDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 10904 bytes
SHA-256: 8689225c4b6a6eab1044ddd09b5c4320b173a6df5ff65a2170fbc6f1f3a3ec76
font_02_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 17036 bytes
SHA-256: 43c58005ea1711884f726b9a1b180b8970b0cd8f746bc4318bcea04d1f6fb7c8

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