Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f43d5afe60bc24…

MALICIOUS

PDF

131.0 KB Created: 2021-06-26 20:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3cd0f9836955c56f9bfe9d4078d5917 SHA-1: 93ecfc6778d59fbb2dc3557b7cdcf6d58a844799 SHA-256: 79f43d5afe60bc241d0a465bd292df54604770c1fed0ec2c7700053930174583
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV also identified it as malicious. The embedded URLs likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090b742a7755---wesipireva.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e96e59b6---67241977161.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607000ae72d6f---90981188547.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed1b64a25---61677975899.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/291f5c51beaefe8e3e505b666e87c037/36455850724.pdf
    • http://phoiinnhiet.com/images/uploads/files/4154670357.pdf
    • http://ibb-online.ru/f/file/52037120593.pdf
    • http://sunarfactory.com/userfiles/files/gejaxevojezadibazekebob.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/823ff087bffd5a043bdd0928052049e0/lojurosovasodiguzafo.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160843e62035b1---bagaranovesitirumuj.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9c758c2ba1c78ea6f3d1eee6f3478f6b/jokoviginokojaxe.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/016cbb7fb4bf03a1523497e4382e07c7/54625234872.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/88f832793dee2d7d97b6e4bf9326533a/babawuzavatawi.pdf
    • https://dolmalatrek.com/userfiles/file/47302123484.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0015ceeb9---38709780570.pdf
    • http://momsystem.ru/public/file/xelukirosutebijixedi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d8c5360f---47339914743.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f17f086789---968938837.pdf
    • https://toskov-yordanov.com/userfiles/file/70903584501.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0c486540426fd8b72beae80ff45788fe/zowonaramalaw.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ca43d7bb---josukewojetupapusafon.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a2e7c5a6083eda545d4d9711b8ed8e19/26922956152.pdf
    • https://adsbudget.net/userfiles/file/60689662603.pdf
    • http://jkbprivateiti.com/userfiles/file/17620318777.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+are+harmful+microorganisms
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019572.bin
3fc1a5557a0c98c34f89d16baa8cf3047a605ee65d9bec7cb9366d463efc89f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19572 22880 bytes
font_01_sfnt_off0001ce4f.bin
fdb93f996e9d96a2be3ad941177dd18b8e9d4a3eb05f5c842686dcc66675accc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4F 10876 bytes
font_02_sfnt_off0001e750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E750 16792 bytes

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