Malicious PDF — malware analysis report

Static analysis result for SHA-256 14251cce065658e6…

MALICIOUS

PDF

118.6 KB Created: 2021-09-06 18:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 307f3816a7bc156bddd14bd9d025840e SHA-1: 2c046e0c8c71aca928ab398db5ecb4dc1392f26b SHA-256: 14251cce065658e6fad5023e0ab77f95fc98e5667d6b543e76d4d58b7f37cfa5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI heuristics further supports its malicious intent. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mamnonlittlesun.com/upload/files/nitaforizex.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da062e3110f---68233351071.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/19720329591.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/polikolipolu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d054ad6a75---47582444219.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/neguge.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/jovoxugux.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/21fcbad88810746269d0448448ccaf31/xenagizebenotadavu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vlt6if45j0shlqnitv7ppkivp8/30244991230.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/11988685449.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/46062990885.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f5e0e873e161c17b9c714ce505575736/58201706484.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/sasas.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf643a2a7---28622120644.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/podilesinekaganododajipu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cc80426c904a71e017c2e3f454eed6e3/xonekerame.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/3637736714.pdfIn PDF document text
    • http://spharma.ua/files/file/tututemurosawozodu.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/kowewidofiruxomizuwo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kagodevutoja.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/82075939426.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0bd6d71f1c4ae138e713c2223ee4d919/xevofiweluw.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/60874932768.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/86040304491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transposition+didactique+externe+pdfPDF 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_off0001653b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D52 10880 bytes
SHA-256: 7acb48bad256644f88894d4b0df05e9fa12ba6ae70debbaf112679bce5c9d430
font_02_sfnt_off00019668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19668 21520 bytes
SHA-256: dc25a7c85784bc1b508ded9c5b8aa6e43c19046e8edbf9f654650f33c9299254