Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7ff68d24539826…

MALICIOUS

PDF

84.3 KB Created: 2021-08-22 03:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1ebaa20ad64d36097699a514a1fe2c64 SHA-1: 7f049647a3b4d02e6f8ecadc9eb873e17a4b7df8 SHA-256: ab7ff68d245398264bca54dd6cf9ed0bf18c590dcbfbd426cca091ef9642c9e9
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised or disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://parkettworld.com/upload/files/ranojiduresino.pdf In PDF document text
    • http://l-max.ru/userfiles/file/vugosiwovolarijotixigej.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f44c2ad442e---73905971449.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/342432640e968b243b1b052572811712/37626864780.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a5c0f260a2945423dc6ae46d3f2c8f19/wurilega.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vafijagijuxunufad.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f57a13ec2---49038765107.pdfIn PDF document text
    • https://comfort8889.com/upload/files/jilerulugot.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072780349e5e---89801519343.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/dejib.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3uqbjf7b36d81g3kclc11rvad7/81491327724.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/zoramulupelokatarur.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/sikulabenepiw.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/43065834059.pdfIn PDF document text
    • https://sinarwaja.com/account/files/powapolatopi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b502ddd769---dopavozusabolunanuguxa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de32411fd---solosanixugebasikilafe.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608105ddaca52---namelisilezezarar.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3f1f3e383e3ef65f3c9320c59503a027/34972733533.pdfIn PDF document text
    • http://getvisa.ru/images/File/numaxomoxusus.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607625c5ede2b---wezixuxewadiwemu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e14e10665---lidagamuputarus.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/ravugomezelis.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160839dd574df3---85504258494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=who+does+a+functional+capacity+assessmentPDF 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_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10992 bytes
SHA-256: 0791cf2f3d54e6c8f72d67c9860a57f7612b330b9baae2f2d810ad182b74d762
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 17028 bytes
SHA-256: 474a3d95108cddc60d1ce106a4286b2990e2e1a108ab0574046b6b04c7ef5d0b