Malicious PDF — malware analysis report

Static analysis result for SHA-256 c774861132606869…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 03:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8c3a97e806a3e33af55e78d5ff6e93b SHA-1: 48c8d453576d199a8c2bf785001eee910b6e497d SHA-256: c774861132606869d33961a06bd660a917b8ed13d402e7e8c063676cebf6d084
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ClamAV detection and heuristic firings indicate this PDF is likely a phishing or trojan delivery mechanism. The file's structure and embedded links point towards an exploit delivery attempt, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4322

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://garglob.ru/uplcv?utm_term=vlc+pc+to+android PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d72d15011574bfd8ce6c3ee4c77d0c54/sujutujuninax.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b81bc6691d807f64e788731dbaaf6fb4/vasimevujitewev.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911001726.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vekutazepu.pdfIn PDF document text
    • http://apicn.net/upload/files/mavudexuluguxebeparoget.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139feb8e6b76---96754961905.pdfIn PDF document text
    • http://anninh247.info/upload/files/jewitozirokeku.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hos6lhurirs4ua2fbnckem8c53/40264185616.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/85133316342.pdfIn PDF document text
    • http://potlista.com/file/files/revikamikilimilen.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130e51b6c7fa---lejobibosepilowigizubip.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/466f0445da61d1d7b69441ad9da15be4/31799503441.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d35c34b6---jamomilikakameg.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/tamejetajapebalosa.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/76892904438.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ab7d7b9c---golukovidat.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kesibozulekovexurimiw.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/bomidefu.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/lunopidalipos.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/49720692999.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/89930235567.pdfIn PDF document text
    • https://preciseenergygroup.com/media/setadomameleraxuj.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tigase74pchreidealbjq0kv4e/roxaf.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/24963838129.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fdd460b---79450517794.pdfIn PDF document text
    • 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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 17940 bytes
SHA-256: e9a016af64db2738e1322b18befc1934becbd361df6795828a687638b103b876
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 10176 bytes
SHA-256: 7c39b14b52a24cfce0be6a24acc72dd94cb6992b05b3c3457d45814d2c50c795

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