Malicious PDF — malware analysis report

Static analysis result for SHA-256 218ee7c81ce05e21…

MALICIOUS

PDF

93.6 KB Created: 2021-08-23 15:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9c6c91f20020fe3a13715db2c9fe036 SHA-1: f2a977b41806008d2809e86c4e0a820cb8216ac9 SHA-256: 218ee7c81ce05e210ff84a1f02c9c62d60a57d7488b24ccc9516a4d78f8f2abd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external PDFs hosted on various websites, including compromised WordPress installations and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure itself facilitates the attack by presenting a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://underworldgear.com/upload/users/files/97456004782.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/42135559218.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/kubisibiv.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/11308708192.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/woropejifubot.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b728bb834e---netapalafis.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/dupifivonevijigazora.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d26a1bspbn1te5m1iiv4046kdp/49838734313.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9f204b1c9b6cb4a0bd328c4618f178d3/fapevagosejukunux.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2932b0b99bd48f6385a624f2c744aee9/kifawuba.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae5a9aa9c---salixeluxiverowazuma.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/sejp1qnovkfol7aipod51bkqmn/1241266189.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/degar.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4aa3a7e1---37210088115.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jibebiguwifasamiziw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/73213725585.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/bijidopupumifakobame.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831612769b9---95950095553.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf182278ab---jabasosezopo.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b344bf4325a---gotubodarituli.pdfIn PDF document text
    • https://penal-garazh.ru/files/bikeguwez.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/72507631568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=unilateral+night+blindnessPDF link annotation
    • 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_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 17080 bytes
SHA-256: 660379da3bf13d2282ae811ca26dfc5668d5edc9ecdea32a375b226a11a2ac0c
font_02_sfnt_off00014fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 10552 bytes
SHA-256: 352c18cd135a040b5a1e5726f1b820b85b4d953f6445544d92f60fa0059591dc

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