Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8bb7dd167af28f…

MALICIOUS

PDF

65.6 KB Created: 2021-05-13 13:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59dd753780ebeb963fa8c7b2c9f265fb SHA-1: fd091f114bc7e0a33bbef185c2b56e005f436c0d SHA-256: 3a8bb7dd167af28f464f5deb321d0488c2ba52b9dccfe86d7a90ac08fb0c5c63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

Heuristics 5

  • 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
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b1e2d84---96251557104.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2b7eca1de3bea2da580b2be8e649b289/bodutexuvapipaxukomoturog.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e1c50c3fb2c38ceed6c2a74ab69b583/tinesimudirefiwutegali.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077be4d0fb9b---buvobepojamazezuzoset.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/181f8ecd484bbbfac738f7b78b57438a/36460044266.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5a77724d---62386533389.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2ui2b64hu6131e9mshi5m44k73/dapojevuna.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00334f6917881b7c6054e9921e6001d6/76603435805.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05480612d5fa48bf6c2a21c6b6bbec17/67448733011.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099eca384db4---wuwinamivozuwuw.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160789e16e4d9d---53646549116.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609816d05da3c---5781739046.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3a82ff93---56655854556.pdf
    • http://www.aluvascientific.com/UserFiles/file/24923305993.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0fa7c94---tarufubikekawasidu.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a703ija9ikr2lkrdcgqeel2jid/60152295836.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/33n4r9umodgaigf461e6duu5q4/gilikor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=beginner+headway+book+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f0.bin
d74aeca555f36e4526023ac14edd3f209e296094ec4249871ac13c68aa24b7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5540 bytes

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