Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d4c65640ca5456…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 18:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 041ad37f21d45bd5d06f4ae11a90db30 SHA-1: 2da7a3cc8aafdc495ac7c436d88ef7d7a3f4c10c SHA-256: b7d4c65640ca5456e163ee952f6f50baf04563d0572eb8bfc831249b6287939d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fae450a45d1---xijevagusutez.pdf In PDF document text
    • http://kibbkw.com/uploads/file/54220697047.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/7125891207.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c99df364---jusugokowubufukemarur.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ef01b84d---zasetunugagadixuz.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9be29222fe5d89543206a53967002464/wazesig.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b87b6fa430af237eabc5a7640fc7ada9/2601634508.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/miwobebitutabavurute.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vifezul.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/1432409419.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/47996102520.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610bee8f69657---kemidakowojogixe.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/lozesazutezuluruf.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1b3c9f0cc4bdc6cc5c17a8011f53f9a4/22019832150.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/808d556dfd85c981ee7f16b7b75b14ba/38189491607.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/23132070969.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/3420544404.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/xonotuwisijexutimot.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/40584505777.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jm857sc0h9r4lj9qk9ccvn8hq5/kulukofosi.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/zujewalazinenililinagexe.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9b3a5a0f37e0d36461fa8dd0b9c90dde/18962252933.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98921009376.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lanezewasugatonaxi.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/pukejo.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/13024983252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=general+politics+pdf+downloadPDF 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 10736 bytes
SHA-256: ca5166131b48abdf3b1bb9a7f4b9e6e252870bb063db58cd8bbfd46b52391c4c
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 17012 bytes
SHA-256: cac299636943e400a58c76803a8f4d0d55ae3496435d702c6c61731dc3c2c014
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1