Malicious PDF — malware analysis report

Static analysis result for SHA-256 956ed7c10704739d…

MALICIOUS

PDF

77.8 KB Created: 2021-07-13 06:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f19c7e98dd8a3ad80b639efbd02a045 SHA-1: aae953858dc5d9db48fdf34f66e1be75cd2d3dfb SHA-256: 956ed7c10704739dae146851076f564f22000aa09f52725976b14f7a284a00b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure suggests it's designed as a link farm to distribute further malicious content, likely leveraging a vulnerability or social engineering to trick users into downloading from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9cc774c5---wonugelezogotabutebab.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160877810f26b0---zumejujirijimanibubisek.pdfIn PDF document text
    • https://filetorme.com/upload/files/29340896881.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/87378640167.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ed77d440---9977885432.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/levalaza.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc9c8e046---99497180382.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a3774b44c88---92266906799.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/m4jg66osofrrkdoeogh4hj1ns3/21589162586.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/15391085380.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v9ao71hg0dto5lf940urr7je5p/2858166664.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/vapafe.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/82508865967.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f622r6oatmi8u4fn140l5hgift/xoviwonaputafogedaja.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160853f3726ef8---9118571699.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c23573d363e2c06e2eddae6f6db70d50/fikeleguwid.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7004f0122b5f7f323222067841760de5/barelaxe.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/kusifi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/24123541486.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/18058392939.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f445b197f2---82768924917.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/83d371333c36aeb3f6b097c8ab5a9f48/17146944276.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c871a52f508---17557856998.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f0a6078974---36010923389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=express+courier+service+near+mePDF 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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 10644 bytes
SHA-256: 1b31576ce52d019584626069f9fdab8f467b25e75f78abbd21edf15945506453
font_01_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16436 bytes
SHA-256: 861d3df6fa4eec977fb62adab5dfd3285e1f04b24a0e3ce620b73f742f20d63b