Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3f76ab8fa4fc24…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 12:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca8d7481e2d655d50bd579be59a1b0d3 SHA-1: 0716a6b38c13cb73952ce4feaa72bd09dd831553 SHA-256: fa3f76ab8fa4fc24b20058324bb775e80f00bf16a020f68463fe4beefcaae35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The presence of these links suggests an attempt to redirect the user to malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://allytemp.ru/uplcv?utm_term=pdf+touch+up PDF link annotation
    • https://posaonakosovu.com/ckfinder/userfiles/files/leganogavenulupanig.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/95739004192.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/99993730864.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d90777394---kofatudezudenavipe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfc5bb2ef---56058711550.pdfIn PDF document text
    • http://asqcert.net/files/files/desatagowuxov.pdfIn PDF document text
    • http://unseretochter.ch/images/file/67841456043.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/523a0e312faf39a8aca6f6bc4e2ae8b6/45271509672.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d5ccb0d6810c2832bff72b5f897d0cff/14697095004.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/29275588742.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/denekeva.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b186af3f85138207af7a406c79720bd3/valobolutajuwujibisixo.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/dugifojenaxezazumuri.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/89864069354.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a86a176a9b756cf9cacf98c253e94026/xevisuxuzubuvatiku.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/77174917748.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/wemegofux.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8dfa74499f8e3ab6c26ca05d854ebba8/43634904905.pdfIn PDF document text
    • https://yodobashi-church.com/xegetalos.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/venasebarujobatomexipij.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/31605347796.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sijazotubofufewufosigog.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/19890371342.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fanifonavopokufapake.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/39298699965.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/9376784937.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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 16744 bytes
SHA-256: bebc7ae28048fc3cebce8858218fa7a7c4116de21032f12521f8812e5ae14211
font_01_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10012 bytes
SHA-256: 623b0233aa66dba597585c99cbce77ddd8f11afc4659e7e1fd23aa2c57e078be
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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