Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b8756432697c23…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 10:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a4f43c7724248a0f01c0f696e7343d1 SHA-1: bb6075a2a512cfbead393dcc6f9f56aa47032819 SHA-256: c1b8756432697c23ae8db2f74d8d2be31a1efbf31804e3b7504604a93a6a5a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=gta+4+mobile+download+no+verification PDF link annotation
    • https://beautyyaurient.com/editor_upload/file/71738387453.pdfIn PDF document text
    • http://jcpingie.be/public/files/ripumexirupim.pdfIn PDF document text
    • http://placc.info/up_image/zilanufudubov.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/31563627892.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214e57ff61---56134062258.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e847b1d9e2ccdad0841a47681217b497/10704452759.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/poxozalidizeliwojijulo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0910f6b8---90962594361.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/8432784253.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210908_174657.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614254315a670---56169923523.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/fajogenanumati.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/88948840839.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210905_5CBF9DF734DBE98D.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/gelugirotexuzanozovokunu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/wisezulizupomaj.pdfIn PDF document text
    • https://castel.ro/userfiles/file/95321941073.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/59227978248.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130578c4a90f---xisirizewurifimi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mofejigubilixepujavekumur.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/225ef33b8a2c95c9081dc842409a8c13/kekudofiwaxejesufug.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/filubanufojabuzetufaxil.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/38380289041.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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 16756 bytes
SHA-256: 19705c19ae12d3ffe890d40f68deca19691cc4b6e3467629323873c74fecc5c0
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10876 bytes
SHA-256: bd8c3e3964c27dcb59079cc1882b617dc75dd94048c76cbb76920695234413f2
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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