Malicious PDF — malware analysis report

Static analysis result for SHA-256 698c1ad7ac0b9e9e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 20:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ea629073594c02aa989750f28da51d9 SHA-1: 5769ba048aba5de7629babcf55d6efa329283fc0 SHA-256: 698c1ad7ac0b9e9e81a38af92aff634a7b2a0eacc9934a6b5390c8525c831438
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The embedded links predominantly point to compromised WordPress sites and disposable hosting, suggesting an attempt to host malicious content or phishing pages. The document body was unreadable, but the heuristic firings strongly indicate a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=aplicacion+para+recuperar+fotos+borradas+android PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7ccbd5a6---nopiguwoxowokexarikoguko.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gekudaxexadanipisenuvir.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/duxoliwelubupanaxefef.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/6359232790.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091306220173499.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gijumodojefekuwodosadixo.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fogilozijilesa.pdfIn PDF document text
    • https://susta.vn/userfiles/file/janujasud.pdfIn PDF document text
    • http://kdekdyjak.cz/data/xuvurosomo.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/7781870505.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/barajiba.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/zibozole.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/pelenufefa.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dolewovifaliral.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/mefoxosirawawobipat.pdfIn PDF document text
    • http://huefpdf.org/upload/file/20338810812.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed4331702---gapukoxejubipujavubi.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/miroxoresixiluretuw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f5d20d66---36867415532.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413a530a23c---nezoxupo.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fepuvagogaj.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 10836 bytes
SHA-256: b31d882d53ef21fa2dd0d7c344d05d5cd7cc5d3281075ca82019d9a062e34b34
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 18068 bytes
SHA-256: 31c5384e31d899239e6527942f641de44ccbb19e50e4218480e3c7ef12062c08