Malicious PDF — malware analysis report

Static analysis result for SHA-256 d834f6476e0cc2bc…

MALICIOUS

PDF

82.8 KB Created: 2021-08-10 17:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 74932384448b6db9d13cc86391bb3da5 SHA-1: 93b8a848a321c67cf83e9f04b874283c763e3ecc SHA-256: d834f6476e0cc2bcdaf27aa731be44b4e69dcf9650a620f50401aaea422391fb
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating an attempt to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware via a deceptive link. No scripts were extracted, but the structure and URL findings are sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ca97d76b---38680825147.pdf In PDF document text
    • http://flexa.cz/docs/file/61703277745.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93a3c9d14c---58725390767.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/zuserat.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8e5256ad---41433386184.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bisumo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7ju0djamfud8788jr8vua0ncbh/vawiresonosolorerafebuni.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sujanez.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7d84c3b8---gugokenurumixelo.pdfIn PDF document text
    • http://isgsrl.it/images/file/zelesipusutixabavixor.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e69eda579---levedavudixanupapaxefoluw.pdfIn PDF document text
    • http://grupophi.es/uploads/files/mifufuxakakipijorazuda.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/4200726727.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mopenavolumepolezu.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/84438536184.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/102204289274.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vakinafejeka.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/73061877012.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4271858c8d603d9b42c03b7280e5df33/41242036192.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/24789506878.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/65127063467.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobujumon.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/tanikirivi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/50980347c91b03f6583d92aaec94d34c/wipigidobasigufel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=main+tera+ho+gaya+mp3+song+download+-+mr+jattPDF 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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 17632 bytes
SHA-256: 09f24ba82af68703d7daecc108c95dcb69533e2c175a44067b24022beac45559
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11368 bytes
SHA-256: 4749e1688d859732c9c2e4a9aa0266a226740340737e4602d503924cb8db6448
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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