Malicious PDF — malware analysis report

Static analysis result for SHA-256 437bfe8cb354e6b3…

MALICIOUS

PDF

112.0 KB Created: 2021-06-11 01:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 04c9bfc65edd224c3c5716211ea9b139 SHA-1: 096afcbcb2e5998940fa63b0ddd839b4af3437a1 SHA-256: 437bfe8cb354e6b3648ed1acca80fc3b4dfeb3a69e981fb5b3cc09521c49572c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=coca+cola+tu+dance+video+song+download+mp4 PDF link annotation
    • http://cropscipublisher.com/files/upfiles/file/kexadipodugukevawel.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fesanevozujamato.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4811gtps2otgqb0pagjd73g3kb/82246720881.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d0b5dfdd---78714475941.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/71265460297.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/892c9v9csra2tatsg4t9sqq2ko/xuvubekonumurunegadosig.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/osld1chk13pg3ccadbc7rf9ct2/28226710705.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nasojevuk.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c7eo0khr6nkc4658ovhfooo0rc/zulirimomebuloxe.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file/%5C/2021051704583625.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a290da4a85e---54287323053.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8808aaa702---89495991764.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4cd4a8b2---92352701790.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c184692b---bevasovemoravokolij.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lj81pn28e5vtomhrasr110ut84/75434869017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D25 5444 bytes
SHA-256: 5c0f7790740b079abfef842c22958e429a851b6e04f7b96a77a01c7d45eb299b
font_01_sfnt_off00015fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAB 5372 bytes
SHA-256: 27b68e60de254dd0e0c5ad2ed9bf4ef9ed118cc22e9a94bef2107d8a4324c58a
font_02_sfnt_off00016f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F7E 13304 bytes
SHA-256: 132580ae0eaf6aa724e228da8e6c9b5154021cebc4cd47b91ce52efecee5b96e
font_03_sfnt_off00019b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B44 6664 bytes
SHA-256: 9b16a13e550e51dd89e28ee38891c29db9a9c67e8dc785d39562eb1cb5e6811c

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