Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b93ae0ae249f5e3…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 18:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2c5ba75593447baab3b58da6656a7329 SHA-1: 677da8ede2ebfe83bd3c96b500ab492a5c78ba39 SHA-256: 5b93ae0ae249f5e37416c642eb4c99a613aef4cc1d6d7e2d943fec94730ffd46
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to malicious content, possibly for phishing or malware distribution. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://krisoc.ru/uplcv?utm_term=watch+naruto+shippuden+tagalog+dubbed PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f98188e515b89df29970701a6f1da379/bojeduru.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d5c422de78f6ad2f9c367c573d58a064/dujekagidolixusezuredeto.pdfIn PDF document text
    • http://chromavials.com/d/files/nonapagosenipew.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb8fa18ee---30184039888.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4e6e2bc94d0510b5475113a1387cad1c/94405022863.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b5a23235---nusaso.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f77a15fa---8636148291.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa10c72a327---22200631733.pdfIn PDF document text
    • https://bnovum.hu/downloads/kixoxodekaxipijujatu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vf7opifprd5gq2b3raos9eg1la/8769722159.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ddc47d27fe76c1ccc6c7078c04e7a855/96274085337.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/29909742008.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/lumubifofixoxasupe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4f84e827---paxokozoxufefelefeko.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/af3fc5fc31d317ba9e5188a94696412a/lajasomimetepovudugus.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/519fcc9da200cbe2eaf9d719a5e0767a/sodelugofetuzeletitunuxo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0cfaf74fe124c701e7abcc9311b3d22c/dowijakifi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884dc36da6e---mixexuzopapigarexo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5995ca1---monorubiluviroxomifego.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nerubov.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a0c6d2ae17cd64bc0bf75c942fd6c22e/vanusidosazivowizavarire.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/wimilira.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1d8ebd18---melulemo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4c5c868---66970851397.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 3308 bytes
SHA-256: 2528055b6e2d7f8cb4a1195bbc2697e1e9712dbdef998cce5d7af24feb98534d
font_02_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 11024 bytes
SHA-256: 6e13964ef22b62fd66f219ee1c0614711635b0f13eb04ed70d3f8ea22c7ad6b0
font_03_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 18904 bytes
SHA-256: 4f15c4487755db6265b11a9ef53bec8a5eb9f2a46f85cd163438aa862798f000

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