Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d18281275202e4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 03:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37095c69edd245d3091e4b4b9fecba8d SHA-1: 75f00c946df59e3e186b268fadb049bbf5747d0f SHA-256: f3d18281275202e4d0e8d613835af56ff763c3eb3e7576196c32d8ac8d283f59
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rhuyscampingcar.fr/images/files/jaduzaxelonepijupaxo.pdf In PDF document text
    • http://vamaconsulting.sk/userfiles/file/44772586157.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/75016151774.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99627042288.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/xuwojagepejur.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3544c8ae7875ff9d0e02dd93607f7e74/71052522847.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/54018997894.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161271121493bf---botuduniwevoz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ba6d21fe---41157262129.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d543b56ed528b2fd608e340b2e35c05b/rofulazagogok.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90308831007.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0909b7ea4---57765938918.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/56612546868.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kp91uuj79qeco32sdheo0hrgjp/49436443127.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb18e2f05c---35434028704.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210823171321_148950794.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/dofowuvogopo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/243cfe0c92a33f566df46aff244018aa/33044951269.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6debd77ac9a4b2e5e1c5bc2a5d38788/vopojoxafuxojasafe.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/18312980408.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc53b3c75d---lopimupobuvoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=division+with+remainders+worksheet+with+answersPDF 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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 10712 bytes
SHA-256: 2373e81fd8a2caa770c6d4aa76b29a76b69c2c240e8824d08809b0d9fc413fef
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 18320 bytes
SHA-256: 2b55261f162f826fc1f8a89decb339172009a6282b7d39792d1fba8cd6e1a96d
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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