Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ec55ad60d598a7…

MALICIOUS

PDF

97.9 KB Created: 2021-07-16 01:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9425b4ba5b37c57ebc6eaefa0f32cc6 SHA-1: 6f7836eca38495f97f681b68c675d1f9ab77d138 SHA-256: d8ec55ad60d598a74e8dc1a77bd1a0f369bd218f4e004caf33684d9a2d9e5fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://synerhu.ru/uplcv?utm_term=cell+organelles+have+double+membrane PDF link annotation
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bopolafol.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fba92932c130cf424d0907d28a23922b/20692083355.pdfIn PDF document text
    • http://jarosi.hu/files/file/17131551498.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab8e4ed41---52793611299.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/15550617781.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/38425031270.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4dejshqn44cipk21olnlnhbpc7/jetugilerawemeduzuge.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934e897e96a---73867045597.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cf9f6442e80a74746e86daeedb3daba7/6370855133.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/50391536940.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d94a8a573573dcd5fcdcf33fbdaa1e14/vudinorak.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77e17431c---jemazinok.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/jabufigoxodojavo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/84965586334.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/5q5r98p87jllc83l892jnjuiio/15667990287.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e568261df5bd6be01a3408f178fcf597/55530108680.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/sikakinetoliduvaxaw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pudubeturatujikuxi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/91373185729.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/pinokaf.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/limoruzurunej.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c46cc5613171a1e78a8801f1712dc23d/tomox.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa3b83c3b---69629356803.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/pewun.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rikukumelusojotakob.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9qe34ntqlf5nkm2a10iiglo2h5/59954439155.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/telizedapemafobagavepikov.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_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 17240 bytes
SHA-256: c6e4818a2a9f011675c18b81bdfd8c6a4b000f49ed3fa6f5244e282a105d9c33
font_01_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 10840 bytes
SHA-256: e8403ac101d8bfd53aadbc4d454f3ec488c9c741004b66ec2ed50ec9c5f11d6d
font_02_sfnt_off000161f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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