Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec1523476e3c51c…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 12:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acad2cc64b5c00db47ed1317ebb03db3 SHA-1: 3d7ae9eacf69814b3327b07c86509156518b5cf5 SHA-256: 9ec1523476e3c51c86bd18b44d152442250e22c5ae51a951756e3421f6db0eb5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to host malicious PDFs. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of callback lures and link farms strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://boschvietnam.vn/files/usersfiles/files/74123650204.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ce096267a57c5344e958d57e3c58e71b/89844752547.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b1450bd0968b46130adf9a2c63df4543/soxuromuda.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094790c81882---vukomaliko.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79680dbf13---56710246305.pdf
    • http://banlinhkienlaptop.com/userfiles/file/bopufujuz.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/47ca31e063ef5395f2c1110fb8e4c77f/80448799875.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f5b94694b5cb3cbce6a1f28702d7e746/zamoviw.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e685a09dc6---misaroxikilumilofap.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f68262f23---88826034775.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160773655ea450---zapibon.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fa9c9b0d---35550733813.pdf
    • http://monroe74.com/clients/871877/File/43560136225.pdf
    • http://okmarin.ru/userfiles/file/16620484638.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2879a26e9---8988948295.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c82bb11a---73594601477.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/wuzejuwizogimo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/13b6e88e0229da83663dba16d9856f19/koreluseganotur.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ba069f202bdc9ea2f2a17734b95aee89/kegazijifa.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/38d187c4b25148f93b108e929e5edb10/xixoluladafigosujabida.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e9a2c8b4---fikexesotewezupam.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718dc022fae---kikakevuxito.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ce95be54df9b0f09ec6fa953083a02d8/lemidexutugubarajuv.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77334ea030---70519687011.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=delilah+montagu+this+is+not+a+love+song
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018d.bin
28746fb3a8aec46ef83918a241a2632dd110b7d009dad0a33a132acf46a1b3b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 10624 bytes
font_01_sfnt_off000119aa.bin
47f3d08811287d407935b348c302bea29e9378e37342f57fe940b2a3f81b634b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 18028 bytes
font_02_sfnt_off00014889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14889 16792 bytes

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