Malicious PDF — malware analysis report

Static analysis result for SHA-256 897944a9705f63fe…

MALICIOUS

PDF

79.0 KB Created: 2021-08-15 15:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a05b1b4c6b38ee97e9d874bbb63391a4 SHA-1: 66d8424a681e93b822c8dd94c14f7a23bf04b0d3 SHA-256: 897944a9705f63fec3187f7e34328bc986b33c975d432d4f21606f0588af50fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ClamAV detection as Pdf.Phishing.Trojan indicate a phishing or malware distribution attempt, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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
  • 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://ukrainski-rosyjski.pl/userfiles/file/xojamekupefevakuvosixogox.pdf In PDF document text
    • https://biovuspharma.net/userfiles/files/ropazinowiruroju.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/47244075106.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/91542a7176f92c729f8c5ca39e63425a/69864234050.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e9b75f4d101c6f42ec5b289e18be703e/82310637094.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/18706209101.pdfIn PDF document text
    • http://kfbi.ru/content/file/lixujejaboxawe.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0cc81c8d39d07606cf9df6c22795abb9/diziruzazo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bd3d27ec---bulaxiganovari.pdfIn PDF document text
    • https://retta-bg.com/userfiles/58007685784.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/36178405395.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502205218405991310.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440fabc497---28375838523.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/78c5554e15f8c35f7b5e807e8c6ee11d/fojinizegu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/49066b4af304b064d6366ab3040e4b97/gonomidovobaxonezoza.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/bizinukamosugin.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/dimeko.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/zemevomelufevukovijuverut.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/78123030980.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/42008273354.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/84060708073.pdfIn PDF document text
    • http://euro-ex.com/375155025.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zejaluselurilatodiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=n+awasthi+physical+chemistry+book+pdf+downloadPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 18792 bytes
SHA-256: 636fde25dacf4f41f5f30dcb080b71b8e98a3050b3f94913782f92ae537684e5
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 11296 bytes
SHA-256: 121c721d599d15a1b14c72e21ccb6a817640f9cd237cd67b19935a401b35f797