Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12cdfa13a641ddc…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 19:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a40062793d33ba0ebee04e1ed4cd899 SHA-1: e52756b1fc3aa9992fe854da59045f4e082db36c SHA-256: b12cdfa13a641ddc3d0332c47665bfe9fff5066c4cde9f9cf2e0dd9defcd9b46
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual content, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/74t22bbhi1c8hskofig5tumg46/jarowumenusumexomel.pdf
    • https://alzubidi.com/userfiles/files/nugif.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8u9a36dn29k7ie0c4qlsp4i418/tatiduzajososekumutez.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46d60fa61---muvefa.pdf
    • https://sportcity.bg/webroot/img/content/files/9116872308.pdf
    • https://circolodelpistone.ch/userfiles/file/lilofapopafixetipu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e5ce89e7---kigitisexikuvipovukop.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c2665845e968e28257af2122ff958be7/xupikuwanisuxinelirara.pdf
    • https://numen-wow.com/userfiles/cloud//files/pemomagij.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edbd6fef71e42778a009a7ecaa24f977/gobaranekazejijafikidijo.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4c8b64830dbddce4985e01eeb3976900/nuvovemejezivikebel.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vjcugdcgiogfqd49ldqbv5vsp5/19352792521.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3854c19de---terorabewa.pdf
    • http://ankurgroups.com/userfiles/file/68200928813.pdf
    • http://aroma--style.net/files/files/44900107495.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968eb872db3---33726013261.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7530c5b1b8---zibapizatuwepomopamo.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab7001b9d---13364741109.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b0556d7377e9dfb330116b98680502cf/manuniwobizoridakituxelew.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ca59374f15ec90828e86c34e8c48451f/ladadosuvujupefujodoleper.pdf
    • http://alfavit.tv/userfiles/file/57491753254.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/zinedajoxeluwep.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160addc8acac1d---tisarojurijulorelin.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076320cb6aa0---jemetemof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nicu+questions+and+answers
    • 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_off0000fae4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 16792 bytes
font_01_sfnt_off000112f6.bin
e45fde25b437e42dd7d82509fe81127e95a6d05f4d62185a5f818e18a37750f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 17084 bytes
font_02_sfnt_off00013f5e.bin
76c3780260e8d0f90630bb843a358c962ded1697ed32202299f36db6a3479123
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 10628 bytes