Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34326fe271c03d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 00:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93f26e8f7971969412933b0a58d98818 SHA-1: 6e3b8bcb61cb8bb23fccd20764d012304d4c20fc SHA-256: 9f34326fe271c03d8d804ee798c0d5451d9ae87eeb70dab3a0b60abe993af3fe
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=logo+design+love+pdf+portugues PDF link annotation
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/41569574755.pdfIn PDF document text
    • https://rajakedua.com/contents//files/pikomexe.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/59968499958.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23a6946066---88644219185.pdfIn PDF document text
    • http://charontrade.hu/data/file/68259952067.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/jonomirorowemus.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/14480405212.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/99214252584.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/bapepogo.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/vapusereg.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wojudirikirekawedune.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/sovisikilovowobabem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7dfc1fb1---gotif.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g20q0hllvo2fs0bf1dub1l6bl9/59428905653.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2508efe---sovimulomuvuja.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/podunilum.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bdd3924b9---buwolipasemevijikaxuvi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92f6ec87---suxuridasekedekubitet.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/lolegekexe.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607763eb0d61e---sizovisilijiwoxodaj.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/40720bc21f69ff9779993351c7e97699/93781452269.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/linafonixuferuta.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/89009044439.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rovuzegugajinupozi.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/jazefitifulix.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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 10632 bytes
SHA-256: 6e74fb22d1ec112147bf4405ebe4a0e10db590ba83c09c10f1b80e61055144b3
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 15796 bytes
SHA-256: 7e93f9a582cbc332f48d7712cb50767c22e2ffea926bb83617bed872da20e5fb
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1