Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea63309416864c5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e33f3960fdf1963fda79d4c1dd1dd59e SHA-1: e9234f7c8c219a1cd2351f3a03b525abf409c962 SHA-256: 3ea63309416864c50fdb64009c277af470fbd4b69f65037c9ed08e13a9119c37
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b27ecef526f5a7ce49a37260f96ca9ae/37541709741.pdf In PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/niselizufusagubivexomu.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jumelazoxosarovovefusu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/70021911198.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109181937148421.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sabevo.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lotelukoz.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4mcotclrsf6gqnkp1ia169oqd5/85219360618.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/99940988028.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/94571077955.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/11d32fdcbbcb9d5ced2ffd6993fde3c0/96201053721.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/87501175450.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9eno4jvbdkr59qblhnbdf66e3/68702232163.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238e9dcc42---sawokimasetaxa.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/97049866087.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/92206829436.pdfIn PDF document text
    • https://edusfera.pl/upload/file/gojum.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/40263822297.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/37777680258.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/36e9e5cf78dd1b6e12b60e079d9ec454/99265233882.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/80296623412.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f720690d1f---4788422771.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/69570214258.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4237392576.pdfIn PDF document text
    • https://upaspor.com/resimler/files/pukifagogadovuwuxawufuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=purani+bollywood+moviePDF 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_off0000b453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 10648 bytes
SHA-256: fb1c46e178dd965bee7ebda1e50a23a0d14371ac8a80395140cfe196c817d7ac
font_01_sfnt_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 14920 bytes
SHA-256: 9c041a64506cc69149cbcf0ce475548ebc8f3fc086627daba2d400cceb50210a