Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef92e65c3636858…

MALICIOUS

PDF

73.2 KB Created: 2021-08-29 21:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eed3b239fce47043ff34927847200100 SHA-1: 5b4b2def34edef82fbf336cde3ee4086403c0b07 SHA-256: 2ef92e65c363685821bc8501e1cf8806a86675b9ccc5ab655ba44cb8c6f0d802
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the nature of the heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f52d7f32ffcafdd046a88c71f48e2589/95038967928.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03bcd174823b6e99916d201e820b34db/31523823656.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210714081906.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a1905757adbeaaaef7a491461c802663/27313429330.pdfIn PDF document text
    • http://24cvety.ru/upload/files/vogajopenorepuzuku.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/87496979863.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60128321e---botidu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608522438776d---22966613527.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cabfbb3580f17fe01d3eede70b49f595/10551333280.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9061b7f5d6---sefanuluzupevubijavivon.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/leguxepi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e6ca385c---denuja.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/28592771490.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/riberixo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16kan37gnque2ga2aehbkaqj83/kamuvedegakujovele.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210620114807.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/waxovixomumapadurida.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/199bcafe2c44c949a614c10007cc56be/gepafibajabi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/79168177850.pdfIn PDF document text
    • http://rcot.by/pics/files/jakizaw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ca2954b3b1e71ef5407f8dfc477445b4/tejomodowowokerid.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/59768848671.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3eac21bf---sipelemadanawepenekuzuke.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/viwuxezufodawofurat.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785800c31d1---93689654085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=national+building+code+of+india+2015+pdf+free+downloadPDF 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_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 16748 bytes
SHA-256: e175670d75ebafcd6a182c15bed1014b991c6854c1123fd8a51fff8ead207468
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 11356 bytes
SHA-256: f8356e60b6806900cc0b105d5b7dbf7c68df9a4ef2623ee1eafad689942e5c4b