Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c10ab9e401e18c…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 02:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c3f86822425bfed3ec254eda4062e672 SHA-1: 609fc70fda342c7f333430cd24984fbe30e51579 SHA-256: 85c10ab9e401e18c208c2766ac6cbaa9f48b99ab55bb3ec9ca8dbd334ec39e54
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links points towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ep8qsm4vm3qa0vefdfv6kn99fb/48749692314.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a1730613---85199773659.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d4440554caa38e0764761a0a73172804/lebozubiwu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3fc8df3f---nobodavaga.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160931c18873d2---nudat.pdfIn PDF document text
    • https://anfauglir.com/images/file/dofuxudenimo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344da8b9f3---pesokoxawun.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/69565900873.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vikogev.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc1c3080d---18727678242.pdfIn PDF document text
    • https://actorconseil.com/files/file/lebenijedivotul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nn2j25vqnllckbe8cnj7u73742/zutudusudovekiwakusu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8af5e119---gutopufuvapijo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dnsm5prkq1bdtepeeh6pg1bt36/vesupixatugikupoduvodula.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/kgf80110cnaigbu27rngn0j52e/lomazajupaxejisubosu.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/67901557141.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/31648404173.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/xologen.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e07a8f572---92891959926.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a866cea3fe2---taduvogijuzemetele.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/19985180828.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/6674352451.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/81297409197.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/8043964989.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d3e0dace---72867917786.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/segejifetuzunowakolureva.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zokizaluvibidifekedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=annexure+a+for+pan+card+father+name+correctionPDF 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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10856 bytes
SHA-256: e88991136af6b89f1665263cf11187d659e1c29d50d43dc9d2f685e94c545b9c
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 17100 bytes
SHA-256: 0ddc281f06fafdb1428009b95707917c6115ae3b36b84b0526e9820297a90155