Malicious PDF — malware analysis report

Static analysis result for SHA-256 3246e071b38e9e85…

MALICIOUS

PDF

109.2 KB Created: 2021-09-04 10:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ddd47f7bf2e6a2f826411a713f76568 SHA-1: ffe340bad6e892546380651f9e3e37d4a0ff7cf0 SHA-256: 3246e071b38e9e85447091fcd0df89feb7373494a32cad2bb752f63283096f97
116 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier strongly indicates maliciousness, and the presence of multiple URLs hosted on potentially compromised infrastructure supports the attack pattern of luring users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88da822222---boret.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b7e414039175bfbc769f8b9e8c9e2160/jiketujumalesonutoz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/48786754064.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a648f92---94220072016.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb9077cb8---sopejolukaditin.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084658900664---48865495412.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64a4c3a81---fupasagolikobogewozoxi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/xebixenovepadipebo.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/bufafagesiserizoni.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/53765061609.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wopoziwuvagepov.pdfIn PDF document text
    • http://mextro.de/upload/files/watase.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5137898a---daduzojuno.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/69666866445.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/11828190714.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/97t2448ahm84im5a1q379rr864/worilebi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c517ad512e4---68478822243.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/36907253317.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/ruwofumuvemoxez.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/43150189699.pdfIn PDF document text
    • http://ropesadventure.com/d/files/padorufiraturebirofuli.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/fufali.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffab3da5---nevitokizozibonadizet.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0a4af8e6beb22838073b3be27e319fcd/tabisuwidazowibofidujirex.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e9f311d1---jexiworadunogezo.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cold+war+geographically+speaking+worksheetPDF 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_off00014592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14592 11116 bytes
SHA-256: abbddd7495ef0cb99c30c1ff0c0557647f13719319624c11c71d9e251b657928
font_01_sfnt_off00015f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F59 18108 bytes
SHA-256: de4daae3bbf02ed68fd314789fe763b530937b308f9edfb17036ae506fd6f2fd
font_02_sfnt_off00018eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1