Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad096da0d052a27…

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 15:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5766bb0dad749d1ec69caf420eab26c SHA-1: bcfff5c3b9536bce1c2a18b64fd4c3b13c74ef5a SHA-256: 6ad096da0d052a278adac68968a0351ad3de80512498345f0ea769f86714e7e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting it's used to distribute phishing content or malware. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=pretreatment+process+of+cotton+fabric+pdf PDF link annotation
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/91qiiem8m4oblbgq5sqcf5si3b/45069906491.pdfIn PDF document text
    • https://udruga-invalida.hr/files/75691575578.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/92983319210.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/74517011119.pdfIn PDF document text
    • http://jadeite.ru/images/file/vugoremolu.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/zelijabu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/dd3db29576f9c976cdae8ce5f424e41a/nowizoxaparidezisene.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/39cef7ec3d7eca2fc10a11055f71b3e1/saxuvekok.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vuxogizotolam.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/pudotedozedimidemolumafot.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/gudasusajid.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/94283359718.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/majubexilevajokukun.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59307032594.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944cd8c942f---21523589934.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0036b8eafb---nozugiramuresabatede.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5h9u7de3j9jvrvkoo4s77genl3/fezezolapovifovuz.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/pakenabupuk.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/3492858447.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zibadusidofukujezidegebis.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7761d3e2---jujufadusowulis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080749ace60a---33485682044.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_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 20360 bytes
SHA-256: 7508eda503735dadb1aab4e1ffb7749a6cb5303a8037dc5639221bbc409ee2e3
font_01_sfnt_off000151f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F5 10876 bytes
SHA-256: 9e6541b1a1ed87b1d46ae6411a1123dc61b044bdbbdea9e1639a65de36e48875
font_02_sfnt_off00016adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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