Malicious PDF — malware analysis report

Static analysis result for SHA-256 808574ecad1b79e7…

MALICIOUS

PDF

109.6 KB Created: 2021-09-01 07:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee006d5459c9a13b89b19917400f700b SHA-1: 8561a751b416596389168e1f9c6a084a24428529 SHA-256: 808574ecad1b79e7ec069d6173de37f01ce18f58381dffc605647e0384abc72e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the formcraft plugin. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ClamAV detection and ML classifier further support the malicious nature of this document, likely intended to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6507

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=how+to+sign+parents+in+asl PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124dfa74fa66---dabawotimonati.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161141b4abd1d8---porudowojuwupanetiw.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/videkogani.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a8c28d3---7384451771.pdfIn PDF document text
    • http://ruihuitax.com/files/file/rowisi.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/79004594218.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/83160173233.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/khivg811e5fv7celap8hcrcu1l/lizewafotazesolodif.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/76371513211.pdfIn PDF document text
    • https://aokman-drive.com/d/files/nafijinareza.pdfIn PDF document text
    • https://campermagazine.tv/public/file/71911272662.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/14853905419.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f3b3f43a---zafavatowexixu.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/leniwugavuposafagukulef.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dffce6743---26988284726.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/10108938395.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/mebesatukejoniredagazixi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a18a605895---wuzulagowizemaxav.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/76207071169.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/85055113496.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607001a8a4249---26963463522.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/73732436434.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/28f1b232fe2dc06fca818f40c0d7ab64/lenipewemokuruvego.pdfIn 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_off000153c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C2 18720 bytes
SHA-256: b5cda13fd1d3c48a1278e6950cc172d53dd63f7b450bcbd4087435f3c7d45d28
font_01_sfnt_off00018449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18449 10504 bytes
SHA-256: 825bd71472e99431e2c6bcc3b628a833e3e4ee58459e31dc696513eaee587b8a
font_02_sfnt_off00019c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1