Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f323882bb46977…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fb37680050784708c3f6aff04afd918 SHA-1: f942ae16816d0adc3501c256db21c8dece479271 SHA-256: 03f323882bb46977e340553fa22277ee732d488d59e8365c3e338e91a89361ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://topinsolventa.ro/userfiles/file/mevusonojigurutonuvi.pdf In PDF document text
    • http://superplasticizer.cn/d/files/budepamamoxogatud.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/4408450515.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c2757349dad307a119359fabb1d3e7c1/62361736263.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/sowabobiku.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/55797624442.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b2228479d9d2b30e0815c132ab3e160b/jorogimalaxebotomi.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/xofilogojixofixuloke.pdfIn PDF document text
    • http://fourfoods.com/images/files/73904096000.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4257bd96e---53019766613.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6e1870sguu71b68rkec1fj2jod/mavijojiz.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/srkvc0r7i99bicomrdo3tg9fl5/sopezaworadesemez.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/45832233618.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/lufopivatu.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/2493854581.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f2m49prljbon5p7fd22a2qe57k/kugogafomuxo.pdfIn PDF document text
    • https://gangnampools.com/contents//files/63304220510.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985d836452b---56154405812.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/dokobidakoralipezi.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/jafewogexososenu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/luzujiritapakoxus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d321423da0d---kuturujotu.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/rofexewogedikotuxazoted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jurnal+geologi+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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 10496 bytes
SHA-256: 784cdb6b1339518977ade0431d520e236f0a876ddca4872d01c1cc10a5fe9779
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 17368 bytes
SHA-256: 46937de042c118816072633653359fe6b978499ffc118461ba0007582ad51a4c
font_02_sfnt_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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