Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2c660442d45680…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcf5c8bd449b24dbbb7d3094d32c8856 SHA-1: 89eb505fe8214bc02175a92e35849756902aa1ef SHA-256: 2e2c660442d456802dcaf9f6979eaeaa59f941baa772cdba37af89c153d8ea7f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm pointing to compromised WordPress upload directories. The document body was unreadable, but the presence of numerous links to potentially malicious sites suggests an attempt to lure users to external resources. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3250c7d80---65234831828.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99852e3e0---jabikejetalufakiwepofasaj.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/xopuzelasotelofofuja.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bizigotisaj.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c3da69c6---93871988434.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb26ae00f5---88875830705.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/wixusiwezezepazuki.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nizexufep.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/gatapekador.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210725111150_8d8v8k.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kupulibena.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/voxijikaza.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u8lohq28v613a7d6tr51jtljo3/29119253530.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/50762781422.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///39760299053.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xakujozajexugopuxi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/2268015810.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be026fedba0---mukuxerabekapuwiset.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/38718148994.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c553791a0a0a8ad118acf3d5f11dfb1f/11678449800.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/98278581516.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/65059508939.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/df197e516e050cd0c15f370bf0b61ceb/18816795769.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b179697f5---41945978568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cant+meaning+in+tamilPDF 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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 20528 bytes
SHA-256: 2561c398847d32ae70e6dd1dd0a95637ff749cf879500ae54411db32b9964621
font_01_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 10092 bytes
SHA-256: faca67ce506be8e6de873c92bb232bc57feb21a7fa1ee602fd40a383f4741036
font_02_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1