Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5653c8f46e94e38…

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 14:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38b64a15cb2adc5b507d4d93b87fe196 SHA-1: 9197771ae13a51a2cd38cf61b1a5087778fedfed SHA-256: c5653c8f46e94e386d761b6ecda6ccbc792bc515d89eae0446883a6d646ed4e3
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of invoice and urgency lures further supports a phishing attack pattern, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6a648e5df1f756e8fd4ed6628270aeaf/45000366054.pdf In PDF document text
    • https://karinbentum.nl/uploads/file/96512797536.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/falidirelujegifowevinoz.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/pugaxijazumeb.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/depofox.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7aac790dd52f86a77e851e70efe97f1c/fekafelegemekajozinupax.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/joregajepoximerewexozasi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d3a84aa9---12280025561.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jimikero.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/20074316a72391f4fa336bccac3ed06c/puxomoposewotozuge.pdfIn PDF document text
    • https://seikico.net/img-tym/files/50180281128.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81d7dfe71---56371999683.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71ba51862---15377198362.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qtk622f6g25cdib75vsc9a1db4/jesumopezalegamuvep.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60777814580.pdfIn PDF document text
    • http://sbairs.com/datas/files/37988542824.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e10deca8d---xosinolexoworesodi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/79339877222.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/nelifiboxajegura.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/gazusiketu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/rilipurerinemo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608110b94bff0---povezulojobe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e6a37d15---78369912827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=military+medical+special+payPDF 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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 10556 bytes
SHA-256: b4a3a4f04ad1ed8e4546e55570b1f03cf7bd7b2bd5439cafccb0532346441ddb
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 17156 bytes
SHA-256: 0c7f9c87f2839b259b64ddf81e4acbbcbdd84d175f02df6c215cf22ee31c9067

Open this report in the interactive analyzer, or submit your own file for analysis.