Malicious PDF — malware analysis report

Static analysis result for SHA-256 5412da98c8ac3713…

MALICIOUS

PDF

100.5 KB Created: 2021-07-22 14:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fc99494c73c2604e1e49480c803ca8d SHA-1: 28bb08de81831148da7c401a0eb32fcd79a169be SHA-256: 5412da98c8ac37139d99dda5b148f219a8c18ad2ab420e793758e12e2b52c153
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mimpishio1bet.net/contents//files/lemufediregexixojipo.pdf In PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82840313924.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b15b061173d3621a6cdc3dac4cbb78db/86213791539.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97034a481---malazugidugug.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8bc3419b---laxudupunugasagovomuk.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/47784791008.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608823905edf3---zodiwuxedo.pdfIn PDF document text
    • https://tmtteks.com/files/6533055335.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/432676bf5296fdeb01ce7af9a1e26c07/kovirozonaziluko.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607402e89e7c3---futukafogovadibus.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/27482696661.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vopejedinaxef.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/sijanuvumapuvidame.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085df708c687---bimuto.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rdetv4jhir3q3c285985k27cc2/pezetatun.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e84f89d71f9---pegapaxijaxewosimuginedap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3bb4bde6---moziditipexuzetazize.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/22698423069.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe834997d8---19945084084.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/77743914043.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/gotidizajixuvizikojudu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ke1jr3qd0b9tgv8t97mfucjdj6/46682484053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=one+hour+30+minute+timerPDF 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_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10416 bytes
SHA-256: 238092643fa5f449b4674a38123ad7b99fc1d643f102322ddbe788369219c452
font_01_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 17600 bytes
SHA-256: d827dc4cf7b7822436e5a85e9af1cf79175b30510f0e93a5211d77c77965609c
font_02_sfnt_off00016b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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