Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd61c40e405674de…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82dd10a5913ca28ffdfe7437f2171b5f SHA-1: 6f51a5651c21eb75243d0ab9fe6e81bb9deb6d63 SHA-256: bd61c40e405674de781f00e04894e2d26c80260546a0923e56b6ad133c5c31b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document's structure as a link farm on potentially compromised hosting supports a phishing or content-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb141408ad4---70739104466.pdf In PDF document text
    • http://synhbio.com/upload/files/28613381840.pdfIn PDF document text
    • http://ruresept.ru/files/file/luxopemaxadubiduvujaxabe.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/89324960040.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/96274326809.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84759787679.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8457e29c---xeruke.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/fiwifibegipakanumitemi.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wolegikolepagovagar.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/12780569355.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e2508e6c---13184249091.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a3ab2990e6c43709181defc6db2e41d1/31282039236.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0f083688---mutakegak.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/76679469782.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/45584563162.pdfIn PDF document text
    • https://premium-house.uz/images/file/pemajowupewanuzuretizu.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/bf58045be7ebb08ab6dbaf268f732ac1/65855286759.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/dozadebibet.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf076c3a8---dukepobeganamarusadi.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/31207566649.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6396891285.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-16/20210616162116212308.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fubolimipigolarudi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c7827964f3a13b719d8c31464b21d53d/virosorisiza.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fc4796ef1f12ebd7d781c3aa72970e0b/makubava.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963980e4b9b---zinivenoxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=political+cartoon+king+andrew+the+firstPDF 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 15508 bytes
SHA-256: 6e36b9d30a315ca0555a18e5769cf0b5054cab3e479d710dedeb4d1ad91165f5
font_01_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 10932 bytes
SHA-256: 2ff7a99009c84109e580ad8325abb74c4ee0ad0b43da3e592df67b136703171c
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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