Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b4dbf50e2bf96a…

MALICIOUS

PDF

99.7 KB Created: 2021-05-10 04:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 699224c281d933d7ff9a19a8e5a99b9c SHA-1: a424d3e967cf16ac3e1a13c2f1cf90ba158267cc SHA-256: 14b4dbf50e2bf96ae307489198a03dbaa6d4cf29bbed5852e0f3ea56503d0be0
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/uplcv?utm_term=audition+next+level+love+party+guide PDF link annotation
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4a37a1b55c03d203b97206ac14bf1bcf/voxali.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/91de468825d3479b714949262231d7ae/luleboxemozevu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/robasaxopidekizevales.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a651a5c817---41400893983.pdfIn PDF document text
    • http://allycatering.com/userfiles/52518875857.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608de8e05d43a---jiwixub.pdfIn PDF document text
    • http://amdind.com/userfiles/file/lubujulewadovemipaweroz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04885fca1---jopojowirefulibogap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4ff1d655---turuzuposogelisikute.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5fc70a4d---17266443834.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe315852b---59087522155.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4338f77dd3556c3db19513e0d220942e/19160531866.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1143ff5f---ritepirijewipofusebudivo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/37494579699.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9920dad22---75274217910.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d713cad0---42302057577.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 15500 bytes
SHA-256: 12120df74b50b145e0e5d31f15e86601b7cc30830432e54b948878c4013b98e6
font_01_sfnt_off000143ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CE 5168 bytes
SHA-256: 543b4b893669e0fac3c6dba2cf2921c6e9b6ea486ab31d7e70ca8bb1176d02f4
font_02_sfnt_off00015582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15582 14724 bytes
SHA-256: 14aa90879174bb688b7109463f9883e23fef84de82cfb00ae3e6e239d68cfd62