Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5e869259714c12…

MALICIOUS

PDF

72.2 KB Created: 2021-06-25 22:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1f76e249b9f2f10c9a56bd14a63720f4 SHA-1: 80452f98b063c405fb7f450d75dff62c31530628 SHA-256: 2b5e869259714c127b828ad8208cbff887a5b535a01a3175455c91f7813ab77d
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve to manipulate search engine rankings or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/odf49ce5t5m35m8ilv2k8gevno/fatokoxutobogon.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad8f8115d---nigidibarogopuledebili.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8a9f0f19e42026df8c96b8ef8663d1a4/tipukejupofivijuwojekeka.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/slf1tqiilnv97i4p9k3vti64a2/tagegazataso.pdfIn PDF document text
    • http://fittbike.hu/files/file/bujazur.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d7adb2cfb920257b49ff2ab5f72f455d/lupud.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/fukogiwasipenuvoginikuvix.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160720b270c42f---8282116416.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7b7c882b---48916824561.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/lalugenipefapuwub.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6037d243ac---81242625099.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/7815444977.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/10792180896.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2b65815553a46a37c47ba4894b6938e/tumebixenajifipofeka.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ec87da8c7f39afe58b507c75b2cf2049/duwefol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f39aa703---rapakononusepanarusaxodaw.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/sikewojuki.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14aab45aac---86440746356.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vcujriin4o14011kqaqd36b4s9/jaxenejisok.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/412645f081691e13f74693c4902f0ff6/61032794665.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079068730e6b---64539358394.pdfIn PDF document text
    • https://orrizon.ru/images/file/juleliler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=review+and+reinforcement+answersPDF 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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 10788 bytes
SHA-256: 8aadf42c3733d6763e9a4ef2bf4fec30284d86d580228c2ce8bf454fbc10b832
font_01_sfnt_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 16140 bytes
SHA-256: 081574e24548e2a8135a9592e13dc00193347c5d1fa5f964b7ac46ed30ed1d25
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1