Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b692b327174983…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 23:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b6e454e2f49769addbb16a7d62af0e3 SHA-1: 315d4465ce1b6434a3cbc6181105f8e449551929 SHA-256: 63b692b32717498376b11f8e3be508c99196a1b69f366c0ba8134d2430fff9e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting points to a link farm used to distribute further malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80165494b9---38201102959.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609249cbb6759---tukiwoziripiwozejoxade.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nubobufipawogebedul.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210628210700869852.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/xipiwelolutexugoxixebada.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/rubuzovuros.pdfIn PDF document text
    • http://generoussecurity.com/uploads/mifulasaletumokugasudu.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/0d30b0bb86b0ab62a07b107825c72a04/tupanirovamokomewomal.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/61063826873.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec7d4cd2a---mitolemukujapizotelo.pdfIn PDF document text
    • https://tepihtrava.rs//files/54243012655.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302947ce543---ludelatatave.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/sgebnvac7slivlpi1aiakn0g20/mederebukevuzuxopab.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/xaxuvegabela.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/sooul1qrmri5ms7v9rgim8l7hj/nakivufazutetix.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/c7nk0tvckqnt1r80rfg8ssc3e1/liwopidafatex.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf1aae19be---xaxuwar.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/lumodetisififiru.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/xotolibiberikuzugunan.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/2639609441.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bfa703d1f0216eff17f2c586848ccff6/xusaxopakonilolapuxowupe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8eb5e62537---siziwurojadipabigowij.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e14b7eb1---baganudipusolunewi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/99543852712.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fj6sr7qekoru6kkgcb51rh6lbj/gutigegizafobavumozef.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/82004182937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=automower+435x+awd+manualPDF 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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10804 bytes
SHA-256: 03d3f402d067163f8912aa37e3180f8052c970c2b5713608b255dd1c9d60bf3f
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 18864 bytes
SHA-256: c32a29e7a453a65b5c5c87ef48e00942f492923b5d4f7cadbc49509a7351b448

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