Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc65cc50f9decc5…

MALICIOUS

PDF

105.8 KB Created: 2021-06-29 16:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5929d546d38da53ec30571587a68560 SHA-1: 84dd651013a2d6ddf8628f889c503a1bbf162376 SHA-256: bfc65cc50f9decc5430b8c0b863d05bfc859eff7f7c807aed1e5bc0389e856cd
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 PDF files hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to download further malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a407c798ea6---dadujafojakixasezizi.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cc980c94---24853470049.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/54881315183.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tevemujurinadujene.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dfd643a23092403cc4f117324f209131/dowomovusog.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/32854054242.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1ec8991e8037fbe17b0865e8047258e8/zofiforasige.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210623185239_o3j27v.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef744f0c4f---zutebit.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609842e067a27---18189190081.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb53ad802---60011916158.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r9i5tq6620eermanpe94fp7m39/93717023841.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0nsc26fieamce53dp18uri9qto/70665890923.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfcb33b46d---97578134729.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/77375724826.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/22153335604.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/22573a53a7ba767cda2abeb55c98ffa5/28806882005.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/kavatevorafuvujixi.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/rivod.pdfIn PDF document text
    • http://starsunited.at/upload/files/31613118891.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/56e794152d92e78dc1c3a9fe4d789d52/41535921159.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed0cd1b3d---60390260342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=monday+noon+timePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10204 bytes
SHA-256: 0ef26beca4e41272d36846149bcc5253aa313ec570f613eec1f634cbdfc45cc3
font_01_sfnt_off00013fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD0 19648 bytes
SHA-256: b9ca229a9199d145533b1412f2bf8e3a34db91d736c5d93b72a031cbc550f548
font_02_sfnt_off0001735b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735B 3144 bytes
SHA-256: c781ba929913b033f2f5d97e35ac20a5780109fce446b8962457e7b4ef1032c4
font_03_sfnt_off00018022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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