Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fc0f8554b27de3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 05:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 416d99b298fff0fb607c7ed7f7f11721 SHA-1: c4ebc381597d43f225e4e4cfb188f566e1d22991 SHA-256: 32fc0f8554b27de3d3131f32408796dfb8713ffd9bb9ecdf418efe9d8c6958fb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit vulnerabilities or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=prentice+hall+pre+algebra+textbook+pdf PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d19ff04a20---17376088536.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/53432904328.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/xupuvoturapipejobebijodon.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/mizumuzamedunogu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tatokedijuninilan.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/nujurizetimigedetemi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b371f360718---gukutibakabarul.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/73506195242.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096f88d4e669---42112608838.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b82c35af10---nefexuxetej.pdfIn PDF document text
    • http://rnralpha.cz/res/file/68512896027.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/pinobofixevimerokasiva.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/3070860344.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e14cf3ed1bf7df248219c3ac208f174/39054641829.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875344b1c06---29408107473.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/texobavorop.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/rurafizedipunikipav.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/93123293302.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/fifibuxolisuwitegadew.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/19252150205.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/32890045177.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a6673a4214889fd29943808b248dba22/11152690389.pdfIn PDF document text
    • http://mebco.ru/images/file/42170050560.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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 11068 bytes
SHA-256: 7a68731b84e4b25e588e1f01d33aff764040ad65d0e0c0f83fa65560dca8f413
font_01_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16820 bytes
SHA-256: 04c77ef58db4a483c83d8538052a3401c5881b6caae08914854ab384ad77b115
font_02_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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