Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e894cecc0c247b4…

MALICIOUS

PDF

92.2 KB Created: 2021-08-19 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 77e25f46a7b2924c210b3962b92373e4 SHA-1: 55d749bae49f36b224b7dbe7ec1a8619f6ba9ba8 SHA-256: 4e894cecc0c247b4240e6195c13fe2b5dc762ebb0c306fb69f6ab90ebb03890a
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://adabaskimerkezi.com/upload/file/fupinanenivozolizosix.pdf In PDF document text
    • https://northwestconvention.cz/data/files/sajiboretariti.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/150308533485.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d71c8e610---86901401424.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gctdn7o8sl5f4p4nsfcrr2urc2/zufalab.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608725dae11d3---godaxewawejapotakad.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c03c9786af60e24bddf5f2146c92249c/2459613741.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/77803187866.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf849a6ce7---ruwalomi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nesopesitepi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/17802143223.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2840500b21fa3506ad5ee96ab10e16e3/lobozokataw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/45735790972.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/79980465124.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/lowuwurixaziputetikopu.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/vimegapaf.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7fb5d787---tutelawivexuxowerigo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161072c8196959---9075716960.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7j57tfqrsabjektku1onn0db8i/8822912136.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/63587810927.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/ladefavekuruvoxu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/8170016463.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c264a3cb218---68978318575.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/43737296084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ave+maria+johann+sebastian+bach+piano+sheet+musicPDF 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_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 11008 bytes
SHA-256: ef57a55d80aa179e3a6fe2dd804404fae747df61338178bd223e8a80fc5f3286
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 22388 bytes
SHA-256: 496075e96c3476386279b0a066ff5f6db5cda4ebeab3eaf227f91cc193cd3427
font_02_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1