Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca3d7e118996996…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 02:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf79be6278b2813b210bd597dcb9d43f SHA-1: bc675bca5a4a4add7cc1d7f91e613951661ab5a8 SHA-256: 5ca3d7e1189969965ef729efc69466764f29d7f54faf11406b2e28ac9d769918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lacasedescaraibes.fr/file/mugire.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7033e5c3---felevini.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/80ddd744614a74e7beaacdd388ff73e1/30551558399.pdf
    • http://zsdbiopharm.com/upload/files/74219758394.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6328c273---97098209878.pdf
    • http://klhl.com/userfiles/file/fugimiloxibevo.pdf
    • http://luingpyrex.cz/foto/Image/file/84525622578.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210529_C099633754D830A3.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2g7c0cl6h1i8na36o2tfk472is/mutipixij.pdf
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/badivaxaxo.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a19b2f4dc13c88a9cccceaaf2295175a/80493138310.pdf
    • http://dailythang.com/userfiles/files/retonivexikipatu.pdf
    • https://metricgroup.it/uploads/file/lugujevunotuzosuzubu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce289d680b---4233116016.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0d38cea2---morikexasemafetofux.pdf
    • http://aarogyamedico.com/userfiles/file/kezuwenopexutikifa.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3894ea9d5---14391527434.pdf
    • http://oio.cn/uploadfiles/files/ziwadomibejakojiz.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/96043116804.pdf
    • http://balone.net/_upload/file///xijenur.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210522083531.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/12175610937.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+stacked+or+unstacked+insurance+better
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
font_01_sfnt_off0000f367.bin
d3f0593fb395bcc7a76525dad93508f417bef68f0d202d7e986d9ae90397e60d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 17248 bytes
font_02_sfnt_off00011f3d.bin
e47cf0d2eea12052cfb44426818789aa1a9bd730a459ac1a97dbf97606f4bc2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10600 bytes