Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dea3ab86e49691f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 23:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b956c6094b7af5dbf1b8722b70ed46a SHA-1: 65c90b63ee4734209a09358778ef7d9483819f70 SHA-256: 2dea3ab86e49691f42d4a7d20af4142f6b3534dacbe677c3550736ac7cfd3440
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, indicating an attempt to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=psychokinesis+vf+streaming PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16146adc78e1e2---67657882245.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/1653932155.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/misijeturutotego.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/7276475443.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xonaxolaxezurigederu.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/runoteme.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/29875501809.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xufewifel.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/patitikositagusezeb.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/48720509212.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/80998295557.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee1a553557---60888953659.pdfIn PDF document text
    • https://olterus.org/contents/files/mebemedofaki.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/5391612813.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/34816333473.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/83124722920.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/64254075637.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902155542613942.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3d2cb956---41361672441.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kokijezo.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/ferugazirulajebupejo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/69922662993.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kijodafiwejeluvujutiziv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 19128 bytes
SHA-256: ae18b76f1d54c94a752830aba059bf6c9f3f5e5a73cd64727aec648aa12b1e64
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11008 bytes
SHA-256: 9ed168c83710286c10bcbfd72bc48d8582fd80e297e95bdfc8f12b878ce455f6
font_02_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1