Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff56566bf4eaf2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 18:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdd1f9011fea42389d6f85fbaa1f8459 SHA-1: ce5195472ad349048f7d92529b348ec6f5fc7635 SHA-256: e8ff56566bf4eaf2143be9fc625794a30d8d41cfea98e94a901d77b0fe380063
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself appears to be a link farm, with many distinct hosts and URLs, indicating an attempt to distribute or phish via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vhcvietnam.vn/ckeditor/images/files/difujulisoravexo.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41d0c6c3be---66914085590.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02993e0c0---kolexasitos.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/259867849dca281c768aea03851a188c/26338426394.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/16804964725.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84597986385.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc253b25a62---94200852019.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zisovilelaxefevesasi.pdfIn PDF document text
    • https://rosycaffe.com/file/23237122104.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6e4ec59a---vuvixawuwatepubixijirafuf.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6b76833a50fb6aa438a880809181e38c/perufejivekelejamuxi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/93568ab9533edc740f16908464a6a257/bumaranezizitizesax.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd570127db---98441509565.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/koteguk.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/fetosomiboxazapeluti.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2d7e1ac785fa4ff3b5ed032fd0759528/15045481408.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/4723864066.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/dijezakupimim.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/biram.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/2791074547.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210520054110_z0goc0.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5bff1bdf---kodudowarituk.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e89b650b---viwudariva.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d01d9309---74593817504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=motorola+walkie+talkie+manual+md207rPDF 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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 16276 bytes
SHA-256: dc174a4ea96d824104a638a1bfeb3a581cb8646632ec265c725807fb1faa3399
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 10804 bytes
SHA-256: d071b208460859fdb093e6212af498f5d10f2e1738c2a5feb4441a367adeec71
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.