Malicious PDF — malware analysis report

Static analysis result for SHA-256 536e8462a9c25d82…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 20:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 227051d63fcb4289c695666eb2f93936 SHA-1: f0ff941679ebea0f8bea2820f7fe177b813fe490 SHA-256: 536e8462a9c25d82c96f1f68672e369ad3b92957eb97a5cabf6c2b20a87792fb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The primary attack pattern involves luring users through these links, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4tk98789rlcs07vno2poba50mu/xageduxamavud.pdf In PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vinezaxavesatug.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/54217267830.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/83513253500.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_AE912B621700115F.pdfIn PDF document text
    • https://jck.ro/userfiles/file/52564576361.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133e04ab45b7---43925259394.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xobevaxareganewugoduxemeg.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///5069045352.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/dudinusorasozev.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/60512125899.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/rerononitexelemelisefex.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/72249d482ccd150665ac65d70371d1d4/mopamevaju.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wifojifaxazerolurisanezi.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/29654258219.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/reguvusovubozowabebaf.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/retobumukesomatutij.pdfIn PDF document text
    • https://servauto.fr/img/user/file/fokef.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/rixokeporolomujiduruwiruj.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/98516195432.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/44712629679.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37480380587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scientific+paper+example+pdfPDF 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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 10672 bytes
SHA-256: 548b23f4d0fc01ff055eba703e4f6e4daca06a92a5d03849e2b07ed9f548cdb1
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 17320 bytes
SHA-256: 08b0b0b156784f0b9b68b2674c8a2e92c578416177d71ff696911049005ed3e7