Malicious PDF — malware analysis report

Static analysis result for SHA-256 e598da6f3159b384…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 07:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12c5ed0bc9f86a9b3016b77bc7d92da2 SHA-1: ca33d6cd33c0a22e6f61eaae34feaa60a9c96a3d SHA-256: e598da6f3159b3843e382afc9334cdbf27986f53b0d75cbedff1be29e38e0a08
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis to the document structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a2a01bf---latalokasetulexotam.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9803501ce3---lurizidebenunanube.pdfIn PDF document text
    • http://blueyee.com/upload/file/301556256467.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9afc1c44c---53167365637.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/36397470187.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a0sjuu8bk2r2mhq9iqlo2pkhq7/673049446.pdfIn PDF document text
    • http://berbun.com/user_img/file/juwefasufig.pdfIn PDF document text
    • http://nfc.soo.jp/file/pefofisegageg.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81097535948.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4or9ua6efa56o3nr2oerfuamd7/zutafosuvi.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/fivenutagegexarasedot.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/83326097471.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pizumupuduzolomoremo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/9759267396.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f51673ad186---sagubokuwevesalaxewixo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/35929818485.pdfIn PDF document text
    • http://kbchina.de/upload/neganowudusi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/33glbp7f2afufgaiaftl7mmc23/82045259858.pdfIn PDF document text
    • https://turbooto.vn/upload/files/51453665436.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/sadojugapukezugepotil.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7e13c9b---kovajapunol.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/68966238569.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/nixikuxadasodidiji.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22cbc8144---mupima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=leyes+de+los+radicales+y+exponentes+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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 18036 bytes
SHA-256: 537b8ca2e71eeccb10e2e615030dbd0a5a70536c5d1c49428ed3c5d9bc21fddc
font_01_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 10788 bytes
SHA-256: c65bedc8ae1c6c837146788f114eb4513cbbe5ccbe39d7e5a666f374b1dda980