Malicious PDF — malware analysis report

Static analysis result for SHA-256 618a0a5f47210a08…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea901b79b137bf2af7d21932f8fd900 SHA-1: fbbed49dd84e2fa89ef111548d1bd3f962bd3697 SHA-256: 618a0a5f47210a0875414e9cd54a121558874881d0cf9251aef772bd73863b27
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to exploit users by directing them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9012

Heuristics 5

  • 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
  • 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://sbnjl.com/userfiles/files/77209307272.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/lamakofu.pdf
    • http://alexhofford.com/temp/files/file/11649929224.pdf
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdf
    • http://aftckwt.com/uploads/file/16521675597.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160994cda6b706---merisiruvewatumupijawuxul.pdf
    • http://antifftech.com/uploadfile/file///2021052921121652.pdf
    • http://lookkorea.net/userfiles/file/26741315008.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb5094ed41ce9c954065a84c29fba594/2867553923.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f77f6c44eff4e12e138f6929c0e4bbbd/43245157497.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zujujugenorumezumito.pdf
    • https://hotel-la-licorne.fr/userfiles/file/58517702092.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448bc8ba9a---jedijevuzi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607163079be84---wozokezenudibe.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/21f8cf7f37d425773831ab7b292438e9/59649727973.pdf
    • https://ludifrance.fr/userfiles/file/sesupividosusigaloge.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nhnbrpohse7qs02ntg7tr64j45/zoborunuvusebovugasunuke.pdf
    • https://baxsporthorses.com/userfiles/file/25341688551.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ace19264b56---68012883028.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffc87fdc6---zovisudefugafurad.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5396b6302---bafidominorinefasufafed.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f500a6a2278f3af090477b8c2043f6b9/sitikurena.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/snua6umluplj3c94iuggieh45u/32059974812.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380fe8fde2---98171937640.pdf
    • https://tsydesign.com/userfiles/jws/files/rimufurixibamofil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=city+of+glass+online+pdf
    • 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_off00010142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16792 bytes
font_01_sfnt_off00011954.bin
2c415a3c381599ee455c12ec2ff5a7260910f7655a3a5b54b7da2aa0ae618546
pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 17472 bytes
font_02_sfnt_off00014737.bin
730577170a22194307989d59ac38efe9c3253b08bc7a601716a3a537e8331f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14737 10720 bytes