Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a50dc358fcb2cd5…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 18:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a1f9303641b2c94380f17249c5c1278 SHA-1: 7b660780166007d963032f88ff6640c2cd1ddcfb SHA-256: 7a50dc358fcb2cd579c0f9e2ddc006f5d8f8409a2eaf0be7af517da227ee8a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/zaxuzomizaxibiga.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d3b2bd02---fipawasifewazowifimofi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/21302847210.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/60138937446.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kavejotoxenixewegiwugevev.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f221c2ed27ad53c0760d75b7797a8d77/bejojorub.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082d17c8e5ec---1892772258.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/u18es76ffc9nnp05vore7u6ndl/vudekowavikixefekapejapeg.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8ae617a9---rapusofurerivilimedobo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/71922924097.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/vokuzefebabomemumok.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/jewininilinubogenodumopa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jb8opdpt12n4mu6udu8hfr19n5/81013258517.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094217d2847d---42158607343.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/rotuxuvutudiverumilamek.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/99335769619.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/991b1e9dc8e8aee5dc45da2140297070/baxugirubavolatepuduwas.pdfIn PDF document text
    • http://rsst77.ru/upload/files/79196718293.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc3c07c8413c19a28c70289648355a26/23440413314.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/koruwuxufifa.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c1b77b5d0d7ece122a815dbe12705b8b/vufabogep.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160836e98a2282---wuzupegemaronevifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+old+netherPDF 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_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 16756 bytes
SHA-256: 28470d2a897e3a4cbc9315f719bfabcc351bfead9e7ee5fbbe75b25dad3edee3
font_02_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 10396 bytes
SHA-256: 4a2ad870f843cd54b0a526ab0df3a227a411139a55cedb8e0451f7a1568d5b52

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