Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c59676d3b005d…

MALICIOUS

PDF

102.7 KB Created: 2021-06-28 23:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9944b929f6cfd6a4aa06c023e687fd24 SHA-1: 3342d490794eb16b726f320fc8dbaa444f9305d6 SHA-256: 1f6c59676d3b005d24fdeaa1cd7537b1cafccedcf9420e9982c18ebc66f668d0
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious with high confidence. The primary function appears to be acting as a link farm, likely for SEO poisoning or to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d58ddf190bfd63d348051dbb656818da/3882915679.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a06d88f7---taxaviropatepi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9a9b275b7fcd562a98b652d624caf4be/jasupuruwajerugilasufi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fm22j6avtvjhko5ffjqul1ee53/lidigovi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc03798704---xafuwojironujirawavura.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vlgd47frg161t9j23kvehci492/65380798183.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bisum.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c254a10e4da---zowaxibujitumujiwo.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b22d0ca93bb0aad2ba0cfb985e1c7f6b/16384154431.pdfIn PDF document text
    • https://reniuved.it/file/tibosobivazovulatevam.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/72193031840.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e57fcaccc746f0a039dfd14b982251e4/43755781724.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/74572459068.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215152314265189.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851f87de445---3274990805.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080acaa3d51b---65182197405.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/92634943086.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c12i426tdrd3qfg0g5j9t8f1dj/kozoxilewe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8214dc9b4---rinikenafuzadekaxono.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/95732538353.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/ziwijeruxivafupixikesa.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f898kvh7uk4qhcuucm3tbtk4h7/zuriliji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hunter+beast+mastery+guidePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7651e12bb7b5ba0d49c9b2a378451398/13213148270.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8a4d79c3f25c906cf55fbbaf649ae5c1/4292181877.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_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DD 10772 bytes
SHA-256: cb7900afcc830e29ae13c75a10a8c89e0aefe499307a5e22738b06b9f93d01de
font_02_sfnt_off00015e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6F 17896 bytes
SHA-256: 72bd82f819407a06288267733e63c5a776fb9b34ca0661ae8b2c99b9f9b69e7b