Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b5d2c5c85422fd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 19:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca5fed5deccf13d342a76b6c0450c80b SHA-1: 6b9ebca1d78bccad4de32733120cb2b2e2b4a573 SHA-256: d3b5d2c5c85422fd1894a3f474a8513f047d7e7e28d6778843c22ebe9a30f5b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lire-les-notes.com/ckfinder/userfiles/files/10276875806.pdf In PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/litibigelegemaw.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wuweraselewifugifexeteru.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/magajumasuv.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/nezokinisowufuwuja.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/tutolilureziwenuzaxakajo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/97033994793.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88805734058.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdfIn PDF document text
    • https://datawire.gr/files/files/vagusinugububovibaremes.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06e3bf2b---zutowomekejapubojonovesu.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/48249393576.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/94133278275.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/564861636481630975818.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ae835a42---67480419770.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/botisuza.pdfIn PDF document text
    • https://maymac.info/userfiles/file/69578463296.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/51672092446.pdfIn PDF document text
    • https://adikketiga.com/contents/files/dafukisojutewasigidawe.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wubolewadatenamixanakuxa.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/rulosowugajori.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/woviwufigomaxovewufib.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/70366190699.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cdb08050b---juxoxanexaxeb.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/46158468221.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/98f666026a9a42cd3575c11552090d20/80173733636.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/14989565606.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36850322152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+vice+city+mobile+androidPDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 17880 bytes
SHA-256: 745732a59f695cf66be6b7d4e9d6c8e1cd79e70c17e5f72df3b3212a81452fac
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 10720 bytes
SHA-256: c6260f33bdff7401b9cacfa5f5ae0a51a33c862a186f5282f8fa24c96da9d453

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