Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4aa864ab9a5a29…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 313085172f1caf4d0479ebd5e2f88a26 SHA-1: 7ad06859326c590c3cd18785847ba67f1566b752 SHA-256: fe4aa864ab9a5a29c669c1961d61cf562206663f5a2eca1ef2ec6faa84dc2267
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of compromised upload links and a high ML score suggests the document is designed to lead users to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0300f61f5b---76511963627.pdf In PDF document text
    • http://g-shocktou.com/user_file/file/winezex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a721546d462---japolesaxijumerapu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/mujtfjhn29c9uvs7mrq1hjsp02/22823395122.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/vexogopodilufo.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/nemamoruvixavoma.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/selanokireroxezejabuv.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/likumowuvuketepusoji.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1abe32a05---vigefijorotokeze.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c991d68e4e---mimezuraxoxagawu.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/silowanivesazitawakebiwo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d9f871930---12691654698.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/39286223979.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d406d231a73bbe47512b3d8889666f37/3452003322.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-28/20210828184727488531.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716bae2998---6850914010.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/webaxeza.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/35391101362.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/34501328519.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/bomivaveroxarudadop.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/zojotokotidiveditasidu.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/79625890045.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843ee8a61f3---31127701847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jabra+elite+65t+true+wireless+earbuds+manualPDF 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_off0000bb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 17032 bytes
SHA-256: 0d791df8d771b06309fe81f85d21f7d92eeb90406e90ca10b5ef24cd8a7b34c0
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10908 bytes
SHA-256: f2333bc34b76015501ce9dd23d9d8262f7cd71174e2d168fc54ccddf34d1e10b

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