Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b94578325a7df99…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 14:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e257670075bb70b85f60af01dbc3679 SHA-1: 3055f9b31512d10d272c9515d86eb66185535fa7 SHA-256: 5b94578325a7df99de368c7053dae174edae7421488b2bf95dac03d6ddf5c057
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=pubg+mobile+apk+hack PDF link annotation
    • https://servauto.fr/img/user/file/veveruxugerika.pdfIn PDF document text
    • https://adci.vn/data/upload/file/fevug.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ee2ce87f---vezuzevosedi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/73719006618.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f4f0a7a---latisakidaredawirikodoki.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/92147353009.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/zekakebedadinipavawegus.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/11655747574.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f42ed40dafb515b07ab7140f9d4b5689/tewimewifezidu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904061553.pdfIn PDF document text
    • http://www.bandungmesin.com/file/76923179964.pdfIn PDF document text
    • http://epplast.com/files/file/vudesagosazoxuzuzen.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/3580508988.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/42642396574.pdfIn PDF document text
    • https://geniodelweb.com/file/5490326801.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/88059667695.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kuzakewanipoz.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/nukefukixek.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/43691588221.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a39645417---85060063324.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/kuvuvi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a3d92bf---9181370967.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 10684 bytes
SHA-256: e7536dec21b5a1b7d4cd68042ab235584d1b63a1f1b44d766d3044e732a264b5
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16092 bytes
SHA-256: 52ba75a89417fd3c66ea2389e70e43bbfad98dec5108754b48c9eb4cdf14d051