Malicious PDF — malware analysis report

Static analysis result for SHA-256 543de3264a5c3db4…

MALICIOUS

PDF

68.0 KB Created: 2021-06-08 08:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f1e62bed00d128b675d20753197edad2 SHA-1: 13b58102da46481b5cdf0e70aa40e20114724b89 SHA-256: 543de3264a5c3db4cbb955503c164bc42c5ef9340a745e487dd3b25d6b8ee06a
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by its structure as a link farm pointing to compromised WordPress sites and disposable hosting. The presence of multiple external URIs and the ML classifier's high confidence score suggest malicious intent. While no scripts were directly extracted, the PDF's nature and the detected URLs strongly imply it's designed to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=imagen+de+naruto+shippuden+para+dibujar PDF link annotation
    • http://aquatrustfina.com/userfiles/file/wanababo.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/009154a6dfb95ceef2207d687a286d1f/97751673408.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rkkt4pk6jqenpl4la5h1f6fgnm/tanabukagegukibepu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef16756aee---22173412500.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vajuziduzom.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vegibuvuxamopikuwoxuzovu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/buruxamezepagomozijur.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d75873d2---88490067843.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504040819702.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/matapatojuwuxizibid.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e2e2611e02e0c59aec97bf9273023417/mekepalinufilivabuban.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/869fae01cfd97a7ecaecddc106a33257/kovex.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/62e669a0db41e9dac56f99594162dc45/11495325839.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/wanoxajolisovused.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/aa3fbf4629b4e62477a48f3d511b05e8/wewiwuxopoz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 5496 bytes
SHA-256: 5584786fa8a786a50f2b3b2c38233c6eb0a2b3f8d498cab31e23b1a5a876545f
font_01_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 10508 bytes
SHA-256: 9b7594afb764051419fe41643a23707cf7e464c4d01d2e4a38ed5f1d70e4a5c6