Malicious PDF — malware analysis report

Static analysis result for SHA-256 d204b0f4f1b157db…

MALICIOUS

PDF

80.2 KB Created: 2021-08-26 06:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ffc0355e5ce2e8d8a2df3861306c994 SHA-1: d6ff44830a7a6e190ca2d280c04d5d0990e36a81 SHA-256: d204b0f4f1b157dbf509b2efcdc1417dd1f17a6688c0cca8f9043f0e5829518a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nguyenthelong.net/userfiles/files/vaxokutapet.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a414e8b39f3---85237648264.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85eb2307e2---saxorimozixusuvozexiw.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16089c01ad17dd---87198781630.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nowawikiwofeleralut.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102fda7a37fd---51619197197.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51bcb7bd5---83904561061.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/naditapejurugojiru.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f374c168---20305779604.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/zadaz.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/69219072503.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/43011331258.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e52b8ee56---42914601610.pdfIn PDF document text
    • http://hzqzg.com/d/files/jijitida.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/23/bazuri.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/99758082635.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/40047057083.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/jibosudarawosujepube.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/82722294483.pdfIn PDF document text
    • https://clove7.com/userfiles/file/tejixikutebe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728abe37c57---debobijilivivubawusatexup.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1eb6a58a64b2e1839d9a7f937e520ebb/nivakiralujonesijirawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=roman+and+remusPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16548 bytes
SHA-256: 5151d3f33ae04d9e1d4464386e877f79725c9aa1d83300b2474a77aeca75aa13
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10320 bytes
SHA-256: 36b4dbc97f748eabad0485a66c3800b9ae60fd603d84adb6d39adf23e5b87d1f

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