Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cef9b08d0728b77…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 06:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44a052f23a5f799d4da67268a3a774ba SHA-1: 74c6bb283c9b9853594a1c1670471ff80024b88d SHA-256: 8cef9b08d0728b77e6e15c18cc9ca9b866c8ecd442f5fee66c009986d9d98322
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, indicative of malicious intent. It also features a link farm pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for users to download further malicious content. ClamAV detection and ML classification strongly support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=hd+tv+streamz+apk PDF link annotation
    • https://hamayeshniroo.com/shop/file/linenogogeju.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/24911058677.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/sorakunumel.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/gajisujunenudowatobaweli.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d89b8b53f9d494a1dd40199d853e2733/malatogumimenavu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/54859253149.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wonawivotani.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/61238340313.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/zelobowitabuludexanigu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/38836348599.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/43141486889.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/renerekiloxar.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/kawuzanorox.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/32627180305.pdfIn PDF document text
    • http://chieucoingason.vn/files/69357614376.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/39722899540.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3d95274bfdd63e81fbbcf7c1ced599b9/solug.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/88864643790.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613950d30c82f---35675962925.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/52463194155.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/xuvasiz.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_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 17148 bytes
SHA-256: b071f627edb580a960842b15b58f7d4b1654d08bf8d3d825227faf53793ab619
font_01_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10400 bytes
SHA-256: 59ee9cb4824cd8f51e0a8393940073d7c48644be0a5a9f1e4c0215fedc83be23

Open this report in the interactive analyzer, or submit your own file for analysis.