Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61db080af6a3c81…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 07:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ffae22525c3f1be53544b80a17febab SHA-1: 3e01dca65d1bcbdab6baae19323cee2a9523dc4c SHA-256: a61db080af6a3c81f7806df14be2f942ed2520a8f1cf25dbe611acc1c7e78ca4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm potentially distributing malware. No scripts were extracted, but the structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cablexconsulting.com/Upload/file/jipapigizex.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130008f8f605---wotirutedex.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/77938478890.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7f86bde8---41383361846.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/01cd0818fb49baf84655d95fd90defc1/rugubofajekimolevo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/10205780965.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/gugewifixitibuwalugaxi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613758365147f---gomitamonupabivugukex.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/48729947858.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nuvomujezaxedarupakesipo.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/toxize.pdfIn PDF document text
    • http://tiquital.com/documentos/file/80852572928.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/96778198515.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/wagetuvowu.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910115622.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/386522860.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/39343405649.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/25636414502.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/difirinazuxosowu.pdfIn PDF document text
    • http://newcityhk.com/userfiles/zodewavokugerewel.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132602a74e01---durafazebar.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd5dae460---9674850468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chicken+shooter+mod+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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 10856 bytes
SHA-256: 042ec5f5b93d1e9e54a8317cb77a82c8e99b47ad653616e87554b1ad7102d00d
font_01_sfnt_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 18936 bytes
SHA-256: 0e958d153afda45722ce40edc039ca14b174d0fd9627d8598c3874ac691b658a