Malicious PDF — malware analysis report

Static analysis result for SHA-256 b756fd0fd1c3c83b…

MALICIOUS

PDF

132.8 KB Created: 2021-06-12 03:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 505742de9999ee6748341cb35b70bc13 SHA-1: be8e15e9d36205000c1fe422bc344f5434edd5a6 SHA-256: b756fd0fd1c3c83ba088c974fb45c751938d6d01a9006c355d9ab82798092f7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by multiple heuristics and ClamAV, indicating it is a phishing or trojan delivery mechanism. It utilizes a link farm strategy, pointing to compromised WordPress upload directories and disposable hosting, to obscure the ultimate destination of the malicious payload. The embedded URLs suggest a lure related to educational materials, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=introduction+to+food+engineering+5th+edition+solutions+manual+pdf PDF link annotation
    • http://kotolantopeni.cz/file/55075409909.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6abb5cb2---72658372498.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5efe1189---59404738375.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba50ce69848---xalibabu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990121510e6---76070539918.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f4ae00a2---43315211611.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/34aa1bc9dcd7f892d1c1ff4af2694659/8896807035.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/85734133184.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4df1c3a43---52300292197.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/85b9405930a52dc5e9da6389a0bf3021/tajilipirunibelifewerexa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa24883aa---sifipula.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6cad810d8---xolovekudamikujulepa.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/33360415644.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed6c1f0d2---saxowabimemaxowibam.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/latodasiginiki.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/023f4cd3c22eb77c2174490f8bb24c98/74876095813.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB61 3372 bytes
SHA-256: ca2540439c755c7b50f24fd9cb321a79f239b065d113da401ca0f03c8f265d35

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