Malicious PDF — malware analysis report

Static analysis result for SHA-256 451009907359db44…

MALICIOUS

PDF

87.0 KB Created: 2021-08-17 03:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8dc846a40fbcf84b0a5e7b62803ee6d SHA-1: abc06d6a4839700fc0db47e95095f0201fc88709 SHA-256: 451009907359db44885af1c2757319b849e90e7705a6654f6de8e0ee2e5546a6
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, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this, likely serving as a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://queure.ru/uplcv?utm_term=american+flag+stands+for+tolerance+guiding+questions PDF link annotation
    • http://ajarnveerapong.com/UserFiles/file/40513479205.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c86181ac539---27552078616.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/goditiwajopalexefazikajur.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db373b95c41---xisaxovezusafowodivodog.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf97c9c78---85876084958.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821cdea8a09---puposepazegidukelixut.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fdf463c8---foruzamawonupaxafapasodul.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf33768b---vesozazu.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210710_94CA3F917278AD20.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/madikojara.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160714f51e050d---73211391114.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/60824759041.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2mtq7ohar2j2v7rmrhp3bui616/32718252734.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/14426637913.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608687ad803cc---nigakebowazewokoxa.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/belutelaminirevusa.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/fuvesaxilo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fafomedaromufatom.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf97913a2---53145446396.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0hrdetu3a4miu8nvi5nmd12sbq/29181309531.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b226ade4f2---54629710297.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/64799092098.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210613_0B95BA565006A13F.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/36390036464.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983ef754403---siluwifijeboxef.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/bupotukadebik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 11044 bytes
SHA-256: 51e87fe8b7310da57212565e4dc239ac39ca60907c8902f30a20c54aad485687
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 17032 bytes
SHA-256: 88d9da33d8da92b737ffb3466d3a715048c116aed1bb2d70f656786b0a420d8d

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