Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7afb4efe8881f7b…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 03:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ed9f499129f318b539618da053cff49 SHA-1: bd91d877d885f9e0711b739d5e64f90a1abcf14c SHA-256: e7afb4efe8881f7bac951882e4298912ed39e9839533e907c0c4e01d78457c3b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://allytemp.ru/uplcv?utm_term=jlpt+n5+vocabulary+with+sentences PDF link annotation
    • https://psychologgia.pl/Upload/file/69872374566.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zepotumaxexurevusiwavakuv.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6b32999e521d4b78de8b56c841900c56/89851633876.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/abf0eeaf93089b407ca52370f98f0b25/24747475449.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/31458980447.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/335fc22b06bda6ea63cc07273002ebb4/21172716526.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608993b0790ed---80108033883.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6c08ef76554b8be6ceea050a1291d42b/tavotagakojitasuvimibe.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/boluxitefajugorilen.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/34b02753424d32c2f05401774cf78cf6/pupidifipugedoxo.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/natabixi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f10f09d89110a0d645fdf3eb436b63b/serenobadovolemawikiwanan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b552163964a---88904017610.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zirijar.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/88bd00f3dea0a0b27c0f8b6ead13e33c/xadomasiz.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/krnub5e7elk4b6fa49t3thl13f/19783397243.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76386182407.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ba78f147645b63a87e4579db2b78a2b0/34650912578.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c341f4d9edd51450b6ffeb183eab998d/vinovavejisimudote.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb7lfm08cs7cpjeiqi1jrph43/gipugajel.pdfIn PDF document text
    • http://allasclub.com/campannas/file/45521707618.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210605154634.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/42330806618.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210616105153_249741003.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/dosafabom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 11100 bytes
SHA-256: 6deb5632d86d21dd3ada7eef2da28646911575e1837c80625a236b141426e1c7
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 6404 bytes
SHA-256: 9d2ae3db931c86c2306b1406ad03482e205a6ba9d60e897b29fb96ff3a7fe322
font_03_sfnt_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 17300 bytes
SHA-256: 67bde370f030af4fd7d4b9e6f41404b4d621217d88ec8b9e6af174dc3fdca896

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