Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb643420d3939d95…

MALICIOUS

PDF

85.9 KB Created: 2021-08-24 19:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fa0ed10bcda6499c7313fe7a086db0c SHA-1: 43f84b28c45cbdfd06dd62f68a41180afaf1fdaa SHA-256: eb643420d3939d959dd3e877528f2d6d995ea9ac757e17d62d380d6092f0f269
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and the use of disposable hosting for some links suggest an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bfc66c3bd60a670d2d37d21c6321b8eb/nakoviku.pdf In PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/sigenoxeresijosowenis.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b5b8cd0a5716830fab5a01c7d581548e/tukedobirotukinidikaw.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/89167198936.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/1053913033.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/wimazofonizejemupakadak.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/96404515809.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/98558920151.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/42025382987.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61be74ae2a---dofufusemikuli.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/19bad677bba4a0e76531a337b9f1243d/sokunilerexijaxifed.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/79176107489.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/59838154590.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jasolose.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/juxefamatino.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/tokubizelix.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/71547796081.pdfIn PDF document text
    • http://chikatere.com/Upload/files/867400780.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e2e75f0555c01f6c789878ed2e3a6ccd/guzarozozexagebiwedikolim.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-19-19-17-07-31.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/33473628120.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b237677cc37---93565150840.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/efe62e6e6e1c286a15f8c5f8afa9209e/29584301067.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vonafifudutodexewenuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+all+pdf+files+into+onePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10652 bytes
SHA-256: 13dce9afa9d08e65030b66d8686cdb2fb71034b23e504ed5fe58defe32878699
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16516 bytes
SHA-256: ef9f68585b2432aa5cd7f2f950c2a07349b1895a9398c88ef429dc5bc1706992
font_02_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1