Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb3632e6ec75f5f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-09 04:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56e5a1304aae08a19884ad8fec82fc04 SHA-1: 6c8e1d97aabe20b321acd3feb587fd288616d12c SHA-256: fdb3632e6ec75f5f6acb56db5cc0b40585b524f6fb65702708e1f438d229646b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395163420f3---taruzikowazusaturodiwuf.pdf In PDF document text
    • http://bradzo-ep.com/uploads/files/kifosatitefogixitopunot.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/88778957585.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/37561554845.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/lulip.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/gutinap.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/29594897944.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/de3s36bicssirhtididm53clr5/wowotolijabuvimazaj.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/xutur.pdfIn PDF document text
    • http://etkenkalip.com/files/39090576363.pdfIn PDF document text
    • http://lovesenergy.com/file/gedanezezinuzuronogo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/diwomuwatoradopenosobazo.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/15074785894.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/cg7qm1lv9u8hgaimt6himecmbn/33489028742.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/51676287023.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/74769117281.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pagamanatagopabefixepi.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/wixotokovitozolusakib.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/lonisogunubu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a3031ccf16b9d0c02b69cea9caccd8ac/41697883677.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e15419f6---83701406312.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/81704606564.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/7606049395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mohbad+new+songPDF link annotation
    • https://mediaget.com/userfiles/files/37050423146.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_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10408 bytes
SHA-256: 88157e96ae9bcdc1cec46019708a03887193a7dbe3fe583500879ccf3707caff
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 18576 bytes
SHA-256: 1390df556f8617efcdb58b943aa792d9821f7d77752da4bcaad3d7e5f8c0d1fd
font_02_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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