Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0d538940363d3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 06:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89823de01b94e209db09128bb722caaf SHA-1: 899c2be64b63a0d9c37fd815c7a4c1adfa207f1d SHA-256: 83a0d538940363d3407c65b9b02ec2bbf093089f8b64a74414eec4ede0fefa7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tfe-design.dk/userfiles/file/32770909775.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5i2iasth385ugn4ubnempdlo45/92979601438.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/jelapezatib.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/58048219616.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/sidimojamusup.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/307v2d13jqsr7nup8ackkpa0n3/8367678586.pdfIn PDF document text
    • http://epmachine.ru/d/files/38933862083.pdfIn PDF document text
    • http://happy-land.hu/editor_up/27015990026.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/fupitikofiv.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ccd351e5b8f34c32e8cc5d97d8a336b3/zasokasuxujap.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81faeb01f4---torufozavuladidesivesugok.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/23071720541.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/bulojatadasesufog.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8026d59856ace7a1de491b7a84b87979/gizaxono.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7ec7d778fa6d053c06a9efdf7425228b/rilesivitefukebigef.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/koxolodugujuk.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092895740355---82612934496.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9ea0e15b---niraxefigagumidoj.pdfIn PDF document text
    • http://benly-carson.com/product/files/pedodifazakufakelu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tubizimenedelapafag.pdfIn PDF document text
    • http://wawa757.com/uploads/files/mesasupejibigoguwakaba.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d024720e55e---486900523.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/sidepobalepoluniwit.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/015f36fcf48afa1790476843f46509c6/sonitisuxawavaxukopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kopi+excelsa+pdfPDF 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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 18368 bytes
SHA-256: 57b3892477de4153ffd792c2a5cfd0c26f1d5e59bc319eb41ba6a77a63680e55
font_02_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 10404 bytes
SHA-256: 4f9e47b1bbbad5b3708c3aaa748e1e237a7de1e4310fe97877fe2b3935a39271

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