Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff89a08b20d5efa4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 09:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8d7672a12022666027e51b0df3af15d SHA-1: 219ea8a62fc736c03dcdbb94ed8a881aea97c7bd SHA-256: ff89a08b20d5efa42e5cc88064d8aefaf3333fe5ab60add7a1f00073f2300d8e
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ctners.com/ckfinder/userfiles/files/varemivikozexanomawup.pdf In PDF document text
    • http://sushiyaslo.com/uploads/files/pixelizo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210908195135962.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/70671193974.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tivefizitalutej.pdfIn PDF document text
    • http://recrute.fr/files/files/jumevonimojixebeb.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/73310568821.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6001a9160---tutuzeruxaru.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392edccb567---35535853305.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613977a246409---nakuwesusasubanoxopi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb14b3e34b---wuzuvemuvozoditopivakunav.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/50321361384.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/4343355360.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431cfbd54fe---godejudenonot.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/65148359643.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d63a6e8eb---29316779607.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tirodakibazovopij.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/negig.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/21961660671.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/raluwigiwit.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/34738243579.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nojirixafij.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0nqlu0flpe965m1hroi8me16f4/66645460245.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1ef45358---nekirakotalasefivoxibeke.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kemupufuko.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/folupifupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=facta+saiyan+apkPDF 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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10152 bytes
SHA-256: 0a2d539544d153aa386fd64779b0eba368414acf90bdca9f2c1951c75f63e47e
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 18164 bytes
SHA-256: 74e3ea755bd2808fc3cb04ad9aae6aa1fd321b63a85cf5c04948c9077f659bde

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