Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10fe154699e17db…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 10:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f1d09219cf36c2ea75182fa45e85bd3 SHA-1: ecabf0927c81d31643e1ad65a08726cc6f5fa6a1 SHA-256: f10fe154699e17dbff8923f252677e7c72acaaabe33b5155088b59ebcf558163
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=xiaomi+phone+data+recovery PDF link annotation
    • http://share-world.tw/userfiles/file/putawedopukatesogazis.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jobuluwokiwegapejipatin.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fa1la5eb7b99kmdf6n2hrlo6h6/76932275530.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210918_6A4B6C5900F76698.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/wakuw.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/42157265103.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133b929ad178---xulawipe.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45814039904.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/70002305758.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210921_4CF0C1294AC4BD8D.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/lepowelo.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/49129347058.pdfIn PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/voligodutoxoxit.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/35568224602.pdfIn PDF document text
    • http://shahgrp.com/uploads/70240543001.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/fabijed.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/powogovoxevupupoxul.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/33589255642.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/50551272139.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/123b9c89bceb8bf84725a31843f6d57b/vudasiwaz.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/14934441153.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/24314416681.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/67411787239.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/suputodipudajagegevin.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 18596 bytes
SHA-256: 2a9597ad94f73301309ec33f005a9cb270eef6beefa26b404ff5187a474a9a53
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10752 bytes
SHA-256: ea42bbdd265237c99755eda6773eae2e207fcf6c7af72c14a01fedfefa070c9c