Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba62f16b419b0cf…

MALICIOUS

PDF

81.1 KB Created: 2021-07-08 07:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b6c845509b11222799aa1552098300a SHA-1: 85545c4ed0596f7da70fe40574554625c2a13f1e SHA-256: 6ba62f16b419b0cf23b01333d01499218ef81915392829d6e7cfc48f89c6dc37
104 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 compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicates malicious intent, and the presence of link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c250929e7bc23725931db9fa43572ad0/685406202.pdf
    • http://asckhn.com/acskhn/userfiles/file/lumanefetekijokufokekatap.pdf
    • http://ajarnveerapong.com/UserFiles/file/25019375289.pdf
    • https://cambodiadriverservice.com/userfiles/file/21093603508.pdf
    • https://adepotcustom.com/UploadFiles/file/20210529202054114.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e602c7ac7db---22794072531.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160de8cbddf85a---nebinip.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf91758e4f---pujajigerubedelemeroku.pdf
    • http://asbufestival.com/uploads/FCK_files/file/domexuvopubuduwovisipavex.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/be5bf356fb1174129a96ef85ecaa33d9/towifo.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7eb0ae6a2---95037790487.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8a89de26---86172405915.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ecfd105c2---rimorodovoja.pdf
    • http://voszveszprem.hu/_user/file/39306716219.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d0b6e5f6---korotovobota.pdf
    • https://laetitiabernard.fr/images/file/92053168351.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac0eafc15---disitefo.pdf
    • http://hopkinshigh1988.com/clients/75739/File/19097843400.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/273df53a4d4fbede9944ff0748dda969/detipobeganamazifumofuba.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214a89828f---lawizigumema.pdf
    • http://kutyasturak.hu/images/files/xifiviwividefo.pdf
    • http://kunbot.com/upload/files/xegomugijupuruz.pdf
    • http://miltonhigh65.com/clients/874455/File/76015667375.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=notes+of+indian+polity+by+laxmikant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80a.bin
e461eb11c6f09340380da280b24d6931bcea78453a76d0a2bd7be93e40af65f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 17488 bytes
font_01_sfnt_off000105b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 16792 bytes
font_02_sfnt_off00011dcd.bin
dac3d021e6b5ba705ac4273ddd73352f6193ec79a602f967377458c9eb9f1057
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 10984 bytes