Malicious PDF — malware analysis report

Static analysis result for SHA-256 e144c980e97fe3a0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-11 11:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cca4fa4ccbfd2737cf257030bc3785eb SHA-1: 9e581d85ea77bc5830d4f2e4cccfbb6b82e291b6 SHA-256: e144c980e97fe3a0292d5e2f1966f947a15eb92b2c9f1cc235d1e5d55a35e9cf
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple compromised CMS upload links and SEO-disposable link farm indicators points towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=rockstar+post+malone+id+roblox PDF link annotation
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210910_BCB0F7ED7B092719.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/nafefowopipazaz.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/danifitibisop.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d5e84d6fcea83a48c430248d37a4549a/34426046919.pdfIn PDF document text
    • https://afma.pt/site/upload/file/7173285241.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zuwevowazapu.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/71018181994.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/94578759335.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/weketabogot.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/vewivik.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/20159018963.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/35ac3quu0bco88qt1tieg6qd9n/mowijuji.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/12893746797.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • http://osayit.com/images/file/xubakilusegamivom.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/lujumefoxexok.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/pokakefedagetanuroli.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nibelajegajironuxudaturij.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/voxunukidaruxiko.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/fudumemurilirekolijimebim.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/vileduzinotuvejudazes.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/46802785161.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/76011094205.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/28713211312.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca64023d5---54765666750.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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 17228 bytes
SHA-256: fcf10a7204ad211989da148b65eb5c8721543ad9499d9909bd79e93f3933595e
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 11052 bytes
SHA-256: 66d8c75d415d24afbb639768bcd8a33a863b30ed9b1b6eef0a2fdb585e605d15