Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8f038f6f932c7c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 19:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d149f3136063036604b84706ef60bccf SHA-1: 1d5f7709c475d93a6f5eb33809e89f2a26fad50a SHA-256: 6d8f038f6f932c7c017ef44c48eb65624e28cd3c1f09ada7de60a49c89a5c676
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple external links and the ML detection point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7c15f7ccfc330746a4740a7d196d1a75/33334755681.pdf In PDF document text
    • http://splogservice.ru/content/file/23154823865.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e3b0f95651676792584ce969ed06432/tusabujon.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/99i0ns31o27nis22dnph407vvv/giwewapebexijibazikefupev.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967d39b9dbb---rumabezigapi.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/tugumorob.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/fukuvimareneno.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/96025841344.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/48566714635.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/29128342189.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8npsno3vskciiaqicj50mi8tfl/10921987366.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/mifobedafekusumuxofu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/efkd28359r1hueik37i3i5ump2/12475780010.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea5905f0---bidevuboguxoreturi.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/rozegiriloranijev.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cec80ad4c---muxazazijunidesizurakon.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4d4eb918ec8aff09fff9878af9abca1e/51593641412.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/tubowap.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/27813635531.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/muk66f7tmp4ohbmrntmed9i017/zaxixakirudifujin.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/43186295477.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/88b3548af82da30e524bbd3273c473d3/pufomibam.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97a52ec03---77707819771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=getting+an+enhanced+license+nyPDF 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10580 bytes
SHA-256: b99512fc56653cca1bfd90d1a45a93deeb99eeb8564da4812b327c7095223392
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 17420 bytes
SHA-256: 36a386a3916fd327cb370c3b1c6f0a8dbd253c6c8d34ca5b88133bd926d2eec2
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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