Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87cd6cadfe908de…

MALICIOUS

PDF

87.5 KB Created: 2021-08-11 21:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7f7367c93890e6ede56e15655cd10e3 SHA-1: 21c9f1a9c598422297a63c80a66a66840a767631 SHA-256: e87cd6cadfe908deb764e552114da443dd55524e3099a92e62c718c1fd45ff2b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely serve as lures to redirect users to malicious sites, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns strongly suggest an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://alphasigmaoverseas.com/userfiles/file/66167532059.pdf In PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/46017400852.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/waxobigarubinimi.pdfIn PDF document text
    • http://gotween.com/userfiles/file///vovugosadatisisej.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/xufotapisavafasefebulagu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/loxokomatebuvowupuf.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/bisekuti.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/67471998351.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0742adaa6e773239db4ae5bdb93743ba/25566750237.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7979dff---97130430595.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f075dab25---26459916568.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cfdfb19ce---50837959332.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/sawuxegofolubozipepipura.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/95480337137.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/juwukurilekebideli.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58fc154ef---57363785862.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/26271621916.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/12225509636.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p8v7jcs232nr1plhjrpp7uvb5r/83421966798.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c49c30be28---mamoxopotidukuz.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xanibotuxadipefejubupubi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/39433106740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jamar+hand+grip+strength+normsPDF 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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 18060 bytes
SHA-256: 8c9fc35934b3922503410f24b785aa5b1a543f165ac104425e7bb665ff3f8e30
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 10784 bytes
SHA-256: da0383c5f70ba7e70dd133612882981a902f44e89cef1ac37b0e3abfbc0351d4

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