Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5548fde8006304…

MALICIOUS

PDF

98.9 KB Created: 2021-07-21 11:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08326a4642a9cd992fdb08878d884a62 SHA-1: 83b5f25137168a725d174f753e035eb66d2bb7f2 SHA-256: da5548fde8006304f8cdfd0d57cc8a80b546c0b4317d2dd3129fd4be01de589f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. This pattern suggests a link farm designed to funnel users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/22c2c9378772a82de3c85b31f162eade/77249857997.pdf In PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/6021477290.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/85818646294.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30b9945cb---gemidinuzipivefemovatiwej.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160823c1dc7299---zegubozozijurapogura.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/av444t2a5ed25k0v3o37tobd0b/1045688977.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5s9ofqhfltionto05olafhe7qa/madinujegit.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/xomulabudetaterawesu.pdfIn PDF document text
    • http://df-foundry.net/d/files/3769923790.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/damirisepevezepofe.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/56430355200.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b40784b96ed---zowepalunonikezuzoli.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acafca8301a---dudazuvusuxuna.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/42197608895.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/59663456684.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/68316853579.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/lopakidosuxivobezapi.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • http://daydala.com/userfiles/file/tixamoju.pdfIn PDF document text
    • http://dalaichau.com/files/nilexivi.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/fuwemejob.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/162b025fa92fc79140c1267b955e7bd1/16909091784.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/biruxefakofazowimapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=xenoblade+chronicles+2+favorite+itemsPDF 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_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 17904 bytes
SHA-256: 6d0a701c2b8e821a1aa622d1ba6ca9d77f570c3abe668aaec8acaf47c972d877
font_01_sfnt_off00014acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E6 11076 bytes
SHA-256: 8ec73c73aa99f01c539671cdf7615e778d8771a67ddbf7422f7fbc0a171a9c5c