Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be55e7133287636…

MALICIOUS

PDF

75.7 KB Created: 2021-08-14 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 138dee94f26efc4ecddd422e1198bd04 SHA-1: b7e9b3aa56bd53bdbbcf41cf68e0374177299f13 SHA-256: 7be55e7133287636fa8c717e638ae30deea4b0c12c1f9fe67cd3207573bb1c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608527178eaf1---84075941120.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9aa8596e---19938581035.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607710c0e20dd---kuzaniwep.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/32813385546.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0136a8c6aa6fa8a2f0a78cd74fd0bc32/rotetubikawirewazirevati.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7c2f6f1---47832001242.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/27269476233.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/10edbb2b5d21db9749e6d2fe1d0c4f16/valawijodawa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34cd7994e6---leguzutikusimajaxugewiw.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/lonepureronawikugopibube.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983d140b9e8---nopurelowivujeregigo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0fd189867---lenud.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/91908550614.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/fejanelixuweparewa.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/67404578969.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zejuser.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/gawupodotamilebimegoles.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ba4badahr1hfk0qukkvg6nkf7i/96025498372.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/77953633622.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/82329990219.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a484e2c11d9956f33e1dca64b8bc255a/32048796804.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/mibibobigagarabuz.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/k32ihamnm76ud1fn6uae8qc14t/77352086385.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0281999f0fbb041591fcdb0c727e5245/23130132064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=heath+chemistry+laboratory+experiments+canadian+edition+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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16412 bytes
SHA-256: dc3b853cdc50e1897607a47f448dd24691b09caaa607118559d2d9b8ed5bf0d3
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 11212 bytes
SHA-256: 158aad56669287199453f9d73eed8859db3df7a8657f9e35aa2cc2a1960b3a68