Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce571a3874576d2a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6538388d6943b1802fb81bd893fbbe49 SHA-1: 26366b7723e7edac1b901c02151e99b93829ec91 SHA-256: ce571a3874576d2a551519afb7a87a4e6f5b007a28b4003d6e4500bc03b9bcb0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on compromised or disposable domains, consistent with a phishing lure for invoices or payments. The embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://byty-pardubice.eu/UserFiles/File/putipekudaz.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9386153d4---47771632706.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d10a876e---nosalumerekik.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/84964970939.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba312127bf59a76b3b679047d4f8d822/31605969245.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/13342475327.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd8962d67---67504129056.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077559128cd5---pawowi.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///98898821063.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/43103914420.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3f03c34a1b3947579e1bbcfcfcadc3fa/94678643824.pdfIn PDF document text
    • https://netpage.info/userfiles/file/29736574068.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/16475329662.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xigupim.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/07f20b686e0c368189f290d229ad5c35/69195009168.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/tupesuk.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/5605615723.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a461786f9f2---xalisofixemigenarapuniga.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/149shbb2027amjsp26pkpa83k6/bawafabobumaburudutize.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64c778ac5a---67942724600.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/negaguropujiw.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/526085187.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611541bc99805---78613431383.pdfIn PDF document text
    • http://dfanchem.com/upload/files/85091029178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mobile+shop+bill+format+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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 18552 bytes
SHA-256: 1be7d9480c0d439a9e5b451dd4dc37ef18ca48ef3ab8c3f21344851be8a069ea
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 10792 bytes
SHA-256: c638072285995cff24cab64274384b144a7ecec784400c63f1b61a3512e2533c

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