Malicious PDF — malware analysis report

Static analysis result for SHA-256 69544e527cefef03…

MALICIOUS

PDF

91.6 KB Created: 2021-07-04 03:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04fcb51b59294fb59a63ab9e4f724a51 SHA-1: bd7ca316f1bc1186ec1ad3b3d5d3df18a1b5ee27 SHA-256: 69544e527cefef03b3f7dea1ec0f9cbb985c1dc4a3f41a7a6b74c010d1015e75
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm. The embedded JavaScript likely facilitates redirection or further malicious activity, contributing to the overall malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=dawn+of+the+clans+the+sun+trail PDF link annotation
    • https://aihr-iadh.org/uploads/FCK_files/file/34758848311.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0dd58fgprg1e40man1i36lfqf/44713971754.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/27074236865.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/toxapotisanozeruzum.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f824cf69e507581afd6d352bc68b270a/bifajonulevimugiguzalujon.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5995de81bf18e45f3ec89dc454c97ad2/zigisutirozine.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/81109742673.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c99371dbc---4100925263.pdfIn PDF document text
    • http://proxima-design.cz/files/file/67028800954.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/3eb4da338060e6b8b29b695b210c8a2f/78789357186.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/wupuweku.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3660238a1---61418115922.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jbr9jdue1p2sgq45icsg0bf806/23434641077.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ebe95267e69d52d6ff8e358426122352/worunipoginupawoxepasimuf.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a741c605c---kuporinajubozuvolupafav.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a89aba334dcd96646e5f51f5d5a05e42/7806187294.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/17a8cab4c3c8ca4db1f7ce4f95823bd9/55917046456.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070407424673499.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zasodetol.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d8a0af309ad1782f0a618760fdb0b381/68132005863.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/311e29e3743ff60cbf5a58b6313510a5/29409268928.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d107c9fdc2---virogaje.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd656fda0---91451590916.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1537584b6---fidexipekigotikesaneruno.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160709933b2acc---34889470795.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 18320 bytes
SHA-256: cb13e1702042b8029b9cddd2be2f2f37842d29f7fa30bc158306a05e8c7a9f66
font_01_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 10620 bytes
SHA-256: 01e76de84f7b9f3dc7fb08407cc31b67f4644e0524c10d45588564c34ba56223
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 3600 bytes
SHA-256: cad0c5b43c141f3703a92c5ff0593b5cb1db9b790ab2fd78ecf4410836a0a753
font_03_sfnt_off000149c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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