Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b489b661acd493a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 21:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a6374583f56d950508382955683fc9d SHA-1: d93be239315c6c6eaa3528685b4b6bf4e8e539fd SHA-256: 3b489b661acd493ae29bc82155d44dc9406bd44092132d4a5d305938847b637a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it contains embedded JavaScript and a link farm pointing to potentially compromised domains, suggesting an attempt to redirect users to malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick users into calling a phone number, a common tactic in tech support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=android+hotmail+server+password+has+changed PDF link annotation
    • https://idroilektriki.gr/files/file/fobodegofesu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/36364630378.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/96948545633.pdfIn PDF document text
    • http://bastola.org/userfiles/file/68556700576.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/pezilagulisirobu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af5c1ef6d4a23db2687fe6793c888fef/bajejebosovaferidopunopu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/30240442783.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/dosisuguzigajiluposuj.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/wozopi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400dc259060---46567922453.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gatomevolopamu.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/sadinapilagamekugir.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5f7e07e1---31157635192.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/77241482490.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/jugirelagajari.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17388547111.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorus.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xilasadegofafovoradotob.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/30655799765.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/vutasujijofaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f539c33cb6---17283160375.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/buremi.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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11096 bytes
SHA-256: 4e6b980a73463a070301749570846c43663dcb9a752b495e80198d2d4796ba4f
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 17616 bytes
SHA-256: b22c5db772671e4abc4445de614fb09c4fbfb1edd01057755c48af26787ff6dc

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