Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2278fdbe35da73…

MALICIOUS

PDF

102.7 KB Created: 2021-09-04 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d49830cd75d6d8c401f3a005e157921a SHA-1: 9addf730c8853f8cc04abb06c404494c18135080 SHA-256: 1f2278fdbe35da737eff381a5c73be9aa3cf17d089f5e2958e03b0ab63ceea55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous PDF links on potentially compromised CMS uploads indicates a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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://accountingworld.in/singhania/downloads/file/bazadonale.pdf In PDF document text
    • https://bloc-immo.com/images/65005617635.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084415f53342---43194166956.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/kafukubatoras.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12166ac90---62170813865.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88974a9d69---47359886727.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/22058895598.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba7ee9bb03b1ffeb1dc6daee7bfff8f0/nijogejubogadosijikisebu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/38620bb3d03e310554afb2ca12eb6601/49236239609.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/sanot.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b6ffe0929---vamepefibukutovazenuza.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/8288430276.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lomofavasolaluga.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/19576909423.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/21593531865.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae9a93a2---motazajosupukawexukezib.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae6303ace---zaretezajaru.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/72479083351.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/butonobetozizipojerom.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/50b1829edab1e5fb8ddb5d51db87efa8/jesunisabazedogon.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/25971570319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=puranas+in+kannada+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 24036 bytes
SHA-256: 4944dada677bf6c0fe464119b519df6efda2af33f16e8db9d25c046555ec2f6a
font_02_sfnt_off00016aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAC 16364 bytes
SHA-256: e6186e999161ce57077d025d0c52f3bcedc48b6cfcd6e974919c4cf2602c20a0
font_03_sfnt_off0001812a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812A 10672 bytes
SHA-256: 6c95ff4b8d9f7d19c8358a7f29d73b3e4ea38eb0e4da4727dbd94419d15fd746