Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5e6660d3183933…

MALICIOUS

PDF

70.9 KB Created: 2021-05-22 04:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576fbf761b14fc0405b90fda5ab356d8 SHA-1: 73f1661521a1caf20d73ae43c26571e82f449ea2 SHA-256: 7d5e6660d3183933701613c484d56779569b132ed5571e80ac863e4c0c341e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to geometric formulas, aiming to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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 https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/58r051qj5ahfqfbcsg1nbf3na2/38742718346.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099268e268b4---61093811376.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0a72379de95dbb147fb2d08c26a6f8f8/5204434912.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3a2b75ae---seduputejit.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f156f9fc23---15216684170.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5228aa5d8a3177570ff59784de99f195/riripapevaparatojijavu.pdf
    • https://burstallconrad.com/editor_files/file/50599818574.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/h4rndjln2ntpjfsigt0lhtv280/pekitefabebafunovinupojin.pdf
    • https://zlatartopalovic.rs//files/bivukililupusuxuzude.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a91d5c12a133e07decc4794a55d15930/30853728473.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a221dab83---sagime.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ea2966548ffd7abbfdbda6e155dca0f8/21484643398.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e27ca11e32993f7d37604ab3fce6ee85/25304008993.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/daxuwuronumijorobotoxul.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2bd9a79080a7de4110cd2dd3e3f4992/96212903610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=formulas+area+perimetro+y+volumen+de+figuras+geometricas
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e093.bin
5eda36ec49b37776dfb53ae06958bb4efc9a9f1035a33af35fe98a20193ace04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5592 bytes
font_01_sfnt_off0000f395.bin
0f5cae67aaef6e633c93b02cdad7021f97705807495fa23e0caa6513ae7b91f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 11968 bytes

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