Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1397fd9311a001…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 10:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9bcc8066d9f3adf7977793365a5719e SHA-1: cd5b743616f470d30646a1248bbd89fc773fb7a1 SHA-256: 2a1397fd9311a0016ad325f90f0b50e7cf6bba6f546d83d0f4a58ce80bf8b77e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised infrastructure for hosting or redirecting to malicious files. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889279b9c89---wumizupeleme.pdf In PDF document text
    • http://jdhs77.com/clients/58520/File/mebuneredoviloliko.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2d6d5df7aec7d54ed9bb930f5799904/pisuvabapinosefi.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/0h8lkpvm8ksdfololl1vnkr0kr/polodezikoled.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/rovosipasavodaxevasador.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e1b84bed---68045667224.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f07c3479e---85154775775.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/9161761482.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e32aff8d44a3df4207b415f07e86d7b7/binosetadij.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8db933f3b15c1dc65d1771e512f93fc1/pulaxajufobulezejanigapat.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/8521111294.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/baveruligaxu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6d1226c2c5fc7408737decf5ea67e1bc/duduzokewotijuxeripulator.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/luluxifotugizap.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/lixusitikozuda.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/14253976850.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j8m11b8uffhugd14ut08tahj54/82231672718.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/58d7b55326fef0b2159e1ac845f3b3b9/puwobo.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kulosogugefeveronosamup.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/64b680f4a27dbdd1f849cf48dd2be97f/35458041875.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8987d0211a---pafawidakujikanirumorused.pdfIn PDF document text
    • https://avvocatoboretti.com/file/natitevojemumorulesa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b619e28813---getewolaxomufure.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/mategederodufatitutaxotuf.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/zefotatugenumut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=segment+meaning+in+marathiPDF 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_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 19016 bytes
SHA-256: 480a68f7c7b610a62ff52a7498025fbc6f881e3264c0d8646cc9bd604d0c2654
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 10296 bytes
SHA-256: e62e2865e15fbf053b7b71a5e7c58302da52d743f30af62c2bac46d0bd18b664

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