Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bad1cd59ef376e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 09:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92baf5b329ce15ec74ce4c88facd50bf SHA-1: 531ccc3c5b38f99eebab5a8f32dd80620e20d0ad SHA-256: 86bad1cd59ef376eaa07a87f206f743b1df9b0dcb79d594ed02515c172309d0c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d2a6dca6---gutaxapane.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/54243099735.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/99314783315.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/gadiwojoxekumug.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/75724229571.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/80108605181.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613377b1213dc---28898051590.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/21789670500.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fab27e512b---12250050340.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd04d20402---gesegin.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109080349433668.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614f39fc74038---16287731305.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/13725004633.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210902_1F670DB56757E6FB.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/28614325369.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/74629362852.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/23815222097.pdfIn PDF document text
    • http://aa-nusd.jp/wonidoreso.pdfIn PDF document text
    • http://tayles.com/uploaded/tisufovewofu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/19090006934.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/36358315505.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/wewego.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd60b4ec0c---ritazikomo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/96054294944.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/31581775067.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/devemarepogutivasez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=poco+x3+pro+launcherPDF 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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 15284 bytes
SHA-256: 82126d4b18ec075d3e94953e994bfe16e0b3ec0d18e552ed7ab769118a312634
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10488 bytes
SHA-256: 062e8ea01e9ff72eea7c83df8774fdc3eaea3fc44814a5714ace9c48a457d6ea