Malicious PDF — malware analysis report

Static analysis result for SHA-256 306e7afa18361248…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 09:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2060b0a763cb2d75734e0054620b7fbb SHA-1: 169635d2627c05e06f89680416849386fb5f8587 SHA-256: 306e7afa18361248ae966e2546e42a48708a018485b457eed8c3265929d44245
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links to compromised WordPress sites hosting further PDFs. These findings suggest the document is part of a campaign to distribute malicious content or phish users by chaining multiple compromised resources. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2448fa9f2ad3105dd70e7fd120dcf588/kabalikoresi.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/731320501db8210da672e22f3fb2fa23/febelawox.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf0c012b1---wuxelegogudewodobufodop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3d739fa8.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/wujinibabofa.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/57836083816.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c821468edf---43337589815.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/sumebinagonefukogemewof.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccedde914a---78880507795.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b71726f2897122dfb40bd37dbdea1158/jefilekovimezukanefaw.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9b01f7501b406c7929431bad794b9092/66385356134.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/lutefisobarazovokexemapow.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/12686669073.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/32937957224.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/sidalefan.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/xelakorifovadupem.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/kezazejelew.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/bobelemikevedipi.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fonabojovixudajepitugavom.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/47483447272.pdfIn PDF document text
    • https://strechybenesov.cz/content/lunodujagexa.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xeforonez.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/84069172871.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8motleeqnv8f033m5fd84vrh47/67386884036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jitterbug+flip+instruction+manualPDF 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 18856 bytes
SHA-256: 2d959b99675a444c5ef4c88e203e65fc202687c6393959a08630e7864ff9ccd7
font_02_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 11052 bytes
SHA-256: aad4963b3c3d228649993c3fbdff086a2d8f5c7ba7cc3ecd0fe13d8b1858f94c