Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc62519db49dd8e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 05:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7121ac8fa9411fa6db1044aa4da56c4a SHA-1: c197716b63b53de4178a12cf1d1c3c2da3126135 SHA-256: dc62519db49dd8e0d8885ea81e94537b127ba25ee13a944f93eec586b9e47e10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a phishing or scam context, likely aiming to trick users into visiting these links. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://queure.ru/uplcv?utm_term=honor+play+new+update PDF link annotation
    • http://www.polni.si/Images/files/bemudeg.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/silurokuxanixemaxeme.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16134a63492d18---54815615809.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f337e1c2c6---janaboxumesepaxedum.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/6516036706.pdfIn PDF document text
    • http://axwelindia.com/uploads/pixepulajejegivitevaz.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/rekunisonapotivaboloj.pdfIn PDF document text
    • http://ewtch.com/upload/files/40926937693.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ntsdevnskdnp7e236jgokofs7t/79006690057.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/semadus.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/29531064764.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/suketewapivagak.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210919_090631.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1218ef9d11b253310b1844d32bd33842/79824575253.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/sujibulunamajarapuxav.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/kanegumik.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/8935171064.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/fepuwov.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/68781315246.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/64885608690.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/544793402.pdfIn PDF document text
    • https://baglab.pl/galeria/file/58239476231.pdfIn PDF document text
    • 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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10416 bytes
SHA-256: 151aa1d92144cd2fae76e99628391ce7bb3410a6f348783c0fa3847e7107249c
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 18176 bytes
SHA-256: 311e14c71e28c0d811db8e6a81cccda1b5525ec50000bc15db220d00996285e2
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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