Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc52c23f275f0ea…

MALICIOUS

PDF

83.2 KB Created: 2021-08-14 18:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b45449a8dea06ca3f249c5a97ad5456 SHA-1: 1020662c2bddff26dde31e3d12204f6afcdfe95f SHA-256: afc52c23f275f0eab9802bc397e3bb7ade6c38633de4ddbe1925aa9bdf2b3e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=reacciones+de+oxidacion+y+reduccion+quimica+organica+ejemplos PDF link annotation
    • http://babywagen24.de/userfiles/file/79572385859.pdfIn PDF document text
    • https://le27.fr/docs/file/13110887981.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/32323923713.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e56217018---22993704222.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d74193b7---bupudaxagesofawef.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7f18d92f---vadiberapisevalopojexesi.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/15613734813.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e297da39b---3712302689.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wolejikerujoxebujige.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/27811141551.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xugamikavaforexij.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kanotomodizuniba.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/setapemurolubalove.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/64873072840.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/70464686993.pdfIn PDF document text
    • https://loctra.net/userfiles/file/66918187578.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1c1d6ad0---diposudiwaraxe.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/24130635847.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/fipizire.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xamodevikedoku.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/85bfa3238778e8b118c05c80351a04f9/48038404845.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/83581859603.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/bewune.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5b83f04a---59081866115.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fd77189ce40480ce457c79f18d7817ba/24183879183.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/tigurasigapoxo.pdfIn PDF document text
    • 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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 11396 bytes
SHA-256: 93652f3ff8be6ac91b72f5aa087d026f8bb1953291b0b68c67463ff3d5d8d51b
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 19156 bytes
SHA-256: a4be48b6ffded555651ba2e481c22d3012f72e61d5ba0f523793d7d153fec9cb
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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