Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71fe51a353647fa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 14:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dab19c5a27ed4df4c6df849e3903b6c SHA-1: 05352ed8e6ac6f77c2f75ed5227e11c504ac00c6 SHA-256: b71fe51a353647fa1fc0d0dd685f9d05c86384e1de4cda855b4d1c96fb851fbf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=free+50+views+instagram PDF link annotation
    • http://boldogelet.hu/media/nemupumisogopix.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/juket.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153db291f0f8---dutagezasasa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/towifob.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aa9d809db5536d419b267cf6631178d6/farire.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/didabisakusabino.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390e96bfe0f---dirovowanekavover.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/81331675712.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/58591717671.pdfIn PDF document text
    • https://expomediainc.com/upload/file/jazekopudawezibule.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161457ebc00eaf---nigija.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/bojiwepo.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/natol.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/zoteligewilubiguvof.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ceac81c1d---19300862863.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zavubapejevivutat.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/nizavunati.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/negukixikumokaminepufivu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rozixaxuvukopi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/3194138087.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/6343768970.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/27795236879.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/mevunife.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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 16212 bytes
SHA-256: f41c2dbced45ce25bc4ba15530fd31f3c8ed87a15b517c0e8532f0eeeeeb4395
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10672 bytes
SHA-256: b709d72c467d3bc66d7370a6252186c64c35682c6530189752a575cce00d39d2

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