Malicious PDF — malware analysis report

Static analysis result for SHA-256 119633aaea153317…

MALICIOUS

PDF

92.1 KB Created: 2021-08-11 04:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5692fcd460f1deb98499f43940851f6 SHA-1: c719859aa0d907c836107b961113857d5d597c96 SHA-256: 119633aaea15331730abed257596e25d8f05bb4a09e16c2dee201be5812a03fd
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates this PDF is malicious. It functions as a link farm, hosting numerous URLs pointing to other PDF files on compromised websites. The presence of these links suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5f74d7cb340f9b9c7944ec318efda445/51730151286.pdf In PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cvp863q584j607s6uph39fru9e/jivuw.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/dugipapi.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/lizisanisonawuni.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b31b2e000---takijezom.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6d2b1c3e3699b3a9560f5d7d05d5390a/43852348286.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/12806785755.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/32057437064.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4089d0fe---8893043818.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc8835d7b28bae5127743c08f259856/38324675236.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/54908648346.pdfIn PDF document text
    • https://hirurgija.me//files/51806542981.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/093aec6af3c0a6ec2f040137a1da305a/55411986967.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877f8409b53---taxitizovakidukisumi.pdfIn PDF document text
    • https://magatek.com/documents/file/gidenutibemote.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073140ace164---56509938295.pdfIn PDF document text
    • http://packamate.com/userfiles/5807088260.pdfIn PDF document text
    • http://qca.ch/userfiles/file/23387000035.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/56496480434.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/18a05c32cfe8ca9c0eccd7e30009b574/90940406695.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/56536728220.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/734d818e51b85ce08e7a10c23484cd69/nuvukowupufarefefidubeluj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86ac618c69ff605ede711b746fe88df7/nufutorutasabewifuda.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/zavibimijelobikeziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+metformin+help+me+lose+weight+pcosPDF 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_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 11044 bytes
SHA-256: b5f4e96ea8649140f6b00f70d1e01e7712263b0e22defd94953b48a06ad16618
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 18008 bytes
SHA-256: 4b57b664528a35d03302a393e6d6059d212df8dc297145d73543a2ffed6705ef
font_02_sfnt_off00014a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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