Malicious PDF — malware analysis report

Static analysis result for SHA-256 6495f277e90e2ff9…

MALICIOUS

PDF

81.5 KB Created: 2021-07-15 23:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 981524821bf94cfc46b21f7a928e977b SHA-1: b22423880da3c8623167dcd5eb31b452b3a5a9e7 SHA-256: 6495f277e90e2ff968623826834a809388a684515464f8465cee7ea4ae58bf05
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on compromised WordPress uploads and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=texas+employment+commission PDF link annotation
    • http://sclifeguards.com/clients/16854/File/rigupezi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/40946895893.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kic03vdqvbeqbhs86jstlophr4/31967028145.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/basakupuwuvukugiwi.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/42807389858.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61955355679.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/3331381985.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8a351bc1---savojofedoguv.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/46b4ee524d73badfd2b2afb059fc36a7/43533044980.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/edc0af3230507dd18a3e31e022629127/merukudasebifin.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075806a1265c---92995471225.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9b2217fb5238fa675a2684ad9df5db52/fodigopipelu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/32011571252.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/26304327107.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c6dc0bd9---vudesirabenipijamarovapi.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/60786727567.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/5094579339.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965f9bbdf---32820088532.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/73511627536.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bc11a2fd96dbe8f80e5a5d4f1c063127/49380626099.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/jafox.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/19460725200.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/wubojururefenedokagulur.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075790d3ca17---gavasekiretufexavogebon.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/20287556182.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d89cc34d---povafukegitufezavop.pdfIn PDF document text
    • 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10616 bytes
SHA-256: 38d02b00eec5b37f8bdd2ba42e3c87d95d319d33dbffbee7e7944a11db28af9e
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16844 bytes
SHA-256: a6e704523533c67d5fbbc907dd5f6e3e235f272dafed3288f39901dcb44b0bb3
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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