Malicious PDF — malware analysis report

Static analysis result for SHA-256 b777ff1f8992f541…

MALICIOUS

PDF

95.6 KB Created: 2021-09-11 23:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b8498341f018d717e4d750b846757ff SHA-1: 63845ce8b30dd4be9bdba6d04494f3a17c90c03a SHA-256: b777ff1f8992f54148ad384617d669db49378b32cdb9c64ead26be8c9c127892
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URLs clearly show a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://golden-candies.ru/webroot/files/files/doparerojenagetofo.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/gikekasizalaj.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7a9d02d9b59a71d391fc835dc5eb2831/jinuf.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vevifiriperemikafavabuxu.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210910054525517845ws67d56fsb9p.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59702260039.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c531a3a1---12101613176.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/vovinorezupamudibaz.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/jeguxepalanavina.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323af33416f---feponetoxetewisopuwebap.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/61177556959.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb91ba2d94---filotepibovegafapali.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/robukukugaxojametesomif.pdfIn PDF document text
    • http://wych123.com/upload/files/ragido.pdfIn PDF document text
    • https://zzwgjx.com/d/files/1505190651.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/wileroxumemiforizo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b758f34e69---93496086832.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/mumena.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/84730169764.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ladatixulojuwegek.pdfIn PDF document text
    • http://vejwun.cz/images/4515331149.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/voxurusabafukizijevisusu.pdfIn PDF document text
    • http://edallyshop.com/upload/files/zexosivigugipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+active+instagram+followersPDF 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_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 18416 bytes
SHA-256: d4472f65f054d0fc643f4d10baba300ce1841b5346934e932a0de57b8089035b
font_01_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CB 10808 bytes
SHA-256: ba25085729eef64007c9bcf5a0059ee026956584be99e816b471c6dcf0c41731

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