Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72d66b509efd5f1…

MALICIOUS

PDF

86.0 KB Created: 2021-08-19 23:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e6c555f371fa081ca17fb0ec9ea9183 SHA-1: 29b98168dd749f6ee18671b14bf468ba5d70d702 SHA-256: d72d66b509efd5f180d9bf8b661cc96b582416c0c65c0ead0438cb31273b49c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ks-puyuma.com/CKEdit/upload/files/45921765768.pdf In PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/kakijikig.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/81088261825.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0j085uto28bsajs072d32p1430/kirogalizipawunazetu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/231f7ad6dc5dd6f6520027b17a70f484/zebemilolerati.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb77751ee---sekawibajuj.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6faefebf53d3fdcce513ee5175388ce1/wusefadepafafuri.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608708aa3ba2f---58484467779.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/ramekejaj.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/99647843603.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/xukob.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b102d3b58e3bc019de28fe99b27da0a2/27170097352.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wobolagakeb.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0abae766b0a3d9255731b08f09537cc8/64071534098.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1f2c37c76bd3a09581b0f7539885e8c6/45909565760.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d112937653dc950cb1a68995de814824/14174104978.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/6565276076.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/lixezelakeguwirupeluge.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/74620758139.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/sufadoza.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160725bbf02a23---ferigogigadaginiw.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/16464939231.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/tekirofadaxomifowedemizet.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d6f4b03e2---xuvizevogesupojavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wanted+full+movie+download+in+hindi+dubbed+720p+downloadPDF 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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 11172 bytes
SHA-256: 33d47c7893ed2cfec1d2f6338dafd39dc8d1827ffe38b13b8d081c07fee944df
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16888 bytes
SHA-256: 63bf0b04351ae01388a34f17ef9ac27b0270bff6f8642cd67dfee5705b3e8d98

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