Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc05fa22e68b5a5c…

MALICIOUS

PDF

92.4 KB Created: 2021-07-29 23:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e6e0b6c9d39b8a530961f73c05fde3fa SHA-1: 36a5acf6e2d0325eb8567f4dc4846b1b2604741b SHA-256: bc05fa22e68b5a5cfb50880e61ff22dbf025127d4aacee77ade940475a306ef0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.mbk-montage.nl/ckfinder/userfiles/files/latovimolibole.pdf In PDF document text
    • http://showplus.ae/userfiles/files/sejusalamagulokigatitig.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd9a65f6a---kegulobenevorepanidi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae30b76e---gunoximeri.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/eea459fb7dce9edec4079a8a1ae54430/23864117126.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/savagiritusenidoriboko.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f63e77e9b59---fakuv.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/36790821474.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/43a7d4b2d3c73322dede0421b21eee4a/xezomarike.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jl51qcmhplr453fedqom1im5ab/fikuguvinidar.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d486ccd4e0b---deridamofunusujavojoraju.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210724_165023.pdfIn PDF document text
    • http://envigest.cz/upload/file/23484310078.pdfIn PDF document text
    • http://charivne.info/images/file/28790636010.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160826a6289cbd---20209163128.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1aab66b7b966f69ece25c73e58280978/dewapo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/75437806948.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/dodus.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7e7ff6a3259ca1a8ec8d221b35edb5c1/91223439716.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/vnh7frs1a4ma094gbr1bfads8p/tixasibekupagom.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096a8e3f1040---78715550014.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/dutufurususubefumo.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/59324692240.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/15949094562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=crash+bandicoot+4+for+android+free+downloadPDF 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_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 18124 bytes
SHA-256: 4c3ebdc2f91a084e197d841fd839709ea7cee0d53901fa6cc99e94e8911f982c
font_01_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 10908 bytes
SHA-256: 47932899c5b92e7705b51b1d581b1a394218fdcc065a3763ed9c9a5482c9e544

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