Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bb15c813cfd81f…

MALICIOUS

PDF

159.9 KB Created: 2021-07-20 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 122b05d546b8b46b2a2474e05a6f757b SHA-1: ac6eb27768f0286ea05c0f7a735cde8f72db50ed SHA-256: 05bb15c813cfd81f96c27b2c76000c468a4cd60710b51d5e7d526037fc41b583
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely to phish or deliver further malware. The embedded URLs and the heuristic findings of a 'link farm on disposable hosting' strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6571

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7casepnp0p88g9pdhktbdm81no/71394388664.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df041ddfdb239c1bcb549b93791411be/19108158587.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/343d037df5e068901d875897ca1b00c3/24328094296.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/8422041267.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/52476988434.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3369a183d1---77969619203.pdfIn PDF document text
    • http://ecole.ru/text/images/file/62493884630.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/nemozozobakefepaneles.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a551c2c964ae5c657b8b0a7ff46472c8/doxifikevazepijopusimipe.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bixatifut.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/wized.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ecda66b65---51132665012.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/58979844065.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1562782a9---33145706949.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/32887912540.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/240e43eddd691263c80f4816bf733bf9/likizipuf.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc700da5b37---gezosexusatuvasafulesusul.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/folorovedoxovoranunakiv.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/68263069965.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/18661104658.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/53399738869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=st+john%27s+wort+therapeutic+usePDF link annotation
    • 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_off00021d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D16 18432 bytes
SHA-256: f59b1475b428601d93a4717cba8b5dbf15529a849630db1025741b84583becbc
font_01_sfnt_off00024dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000265d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x265D3 10852 bytes
SHA-256: c5e6431d71e43d618d2b9641df91c41d1b31bff2c67f365ecc912aede3c3c0c9