Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e2d33a38cf187…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 20:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9afe7218315ac5b531cc7974dbd5cede SHA-1: dc9fad638376f5fab5d15740404ecb04c9cb9de9 SHA-256: 211e2d33a38cf18721f0100313d7b151059e896ea7d00b502da7e81a86c77808
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple compromised domains indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce02fbb172---jitilinevox.pdf In PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/60176521717.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/65649440119.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vcvusi6i5qk7l75fnl9p9cok2d/6496022421.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabef43800---84744108063.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2b309f33---10050343684.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8decafb8413f4b8b5a6392ad2d47efb4/buvusebutigasukisepunur.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44958bd6---dofilolutilojam.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/7377217904.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sobuku.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0f2e8177c2f7add9e1ac81eaf119f6c/50789324992.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/14983644254.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hp4f211drvajvjvkff1jgh677/wavofarigetemetetugak.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cigdlkm62pm5lu36lj9j9hkggh/67177538427.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///masasededilatobuvik.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10184832986.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/59510600565.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/25777731542.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/rixexoledebadari.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/523b0ed29b2ed6fb9c545a7ea30dbc4b/99423340534.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6701e1cc80---41421755480.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/80078036424.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/pibepepus.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6ce6c286362484b4e0183239b55c434a/2185580434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=online+conversion+to+pdf+to+wordPDF 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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10628 bytes
SHA-256: e774b02f4b7c722e88f77766c7a8980a904eb0d25db2059ab9d5810dbc296e18
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 17564 bytes
SHA-256: f0587a25e6c9bf44df8a9e74d1ecc9421dbeade7270c84b32aade52fead02a30