Malicious PDF — malware analysis report

Static analysis result for SHA-256 5714d9a869c42c7f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 04:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5d8489276221bf16a62df812a491c0a SHA-1: 3ad47bfa97bd9e85950fcfa382c8926ccd9cf485 SHA-256: 5714d9a869c42c7f0be179766dd80f6c6787116550464518f01f7d2e7a211156
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly identified this PDF as malicious, and heuristics indicate it is part of a link farm strategy. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

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://medvor.ru/uplcv?utm_term=naruto+shippuden+192 PDF link annotation
    • https://architektor.ru/uploads/file/galexetaxola.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/1487172819.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/41690428298.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vegenosematitafotut.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/90766016306.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/44379490660.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/74450823851.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/19714315691.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/91997079241.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/lugaweperuxoteb.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/18290866307.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac11759aa---judomug.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c30d4a0967a0e03561c75ad0dadbc870/sidelo.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/temopebikudewoxod.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numesewefegagebuva.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ed7c056469f421d978ed4ec01262a302/74797253490.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/67410548108.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/fomikakoputatafenaf.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/kolixal.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/82400418045.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908080043.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/203723852.pdfIn PDF document text
    • http://net-work.cz/data/file/92023131729.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_off0000c2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 10860 bytes
SHA-256: 56dd310df69510bb7a6cb43a0278605ab07bdfa43e7ea19331f0e7b22924fd3f
font_02_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 20724 bytes
SHA-256: d75b6292ac2f5af30cbb49b6a8a121837317b7fcd3131db4f9a642d74fb2482f