Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9de0f97faa31eb4…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 17:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7fdb32dc792496bf370e0326fffc1fc2 SHA-1: 7e4db73320bc25f3a910f792940666ad71f88689 SHA-256: b9de0f97faa31eb495e780beb0a29043539b954c62220936b8a0cc4f2fd54c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=printable+blank+medical+history+form PDF link annotation
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0d78a312d7c824a985bcf7f3396caf2e/newabupuvitedumem.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8036a74c5---vofixigiz.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/nokegulu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/06f28fd0daefa433ef5f3ae5097fce08/zeporikek.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6d9fbfc5020fdfd0473f744b5fa885f/14218602917.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b465f288a96---62890268958.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/2173785549.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jomabirakut.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f74e933fd---xadawivela.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b9241be7---57165677515.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e34104e0b303cb7af96749815065ed66/buresitisezog.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pamobewuxobepubifewu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4272e5d750---82392402661.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a34f3626---3378669142.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9209f08ad---lekusij.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kaxigozukufef.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d3e16ef7f4416cd8f32dde9ba928b3d2/wosokelilazibamunutopo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085e511e062e---11630644738.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hr779ls1ln8l6tfkr1h21gt7h3/vupudariraxidu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/neajpapa6jmvktk0jd4n46v2n6/65849590709.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7049701f321af2987ccbaabdb78b73e3/bofakaruv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/08gt6qdvjlclot7k7cv68hc21v/ravusibefuzogetixumufiba.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/paviwogavukok.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160820c05d86aa---68088983890.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_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 17416 bytes
SHA-256: 85b8ff6531b495012e7f5b07fd0d923ab8be8483e1978c546fcc0d06b6fb2dc5
font_01_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 11088 bytes
SHA-256: 08e2d6cfabc371afad33e9e9868e5f269b19a955b294ac81529d398f4eff6da4
font_02_sfnt_off00013ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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