Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eeff8069135b20…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 07:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 311534654059a6cd3ba319d01c332982 SHA-1: 81eb346c9ae5681b22505c30d65ed589345fd247 SHA-256: 18eeff8069135b20ddaa89c101944e3f6de9f780c5a0eced55e85a0acad32f7b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, aligning with common PDF-based attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc4ea87bd---18647876950.pdf In PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/1056001224.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119a398be371---zikumefumofizejar.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/162742418364860014.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/2318889729.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zesijifujixigelidirenuxoj.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/sufek.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3b0cdab9218fc2419ca45b6de56b63ac/febotilug.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621871498882195226.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f0e8da6fa24dd41ef84800c34b7ddde7/ledulukezimomutazubi.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/musevinajo.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/15360509144.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2pjjh71vhprh7hr6dijo23icd4/36438893367.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/91898224295.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/24320570463.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/mopafi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7d81ddd---kekarowokix.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0cd60209---18780969289.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/65269232004.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4da16d5ba0696c4aa1456c3fee844017/11378928088.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/sapedok.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/85002124762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bioplastics+journal+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_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 19500 bytes
SHA-256: 83fb8972bb0cf5d6bab7f81464e27023386f99b341872d348a49c8bf08048e47
font_02_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 10764 bytes
SHA-256: 1eb8489976290c7281c2675dc4bad8632531fb6c7c229cb932b28dcba6582ca7

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