Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f0128427815ffd…

MALICIOUS

PDF

70.8 KB Created: 2021-05-01 02:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55f62f1473f573cd1032ebe68ed2a05 SHA-1: 5df32eca44379b48b51e2fadc148cfa43b311ebd SHA-256: 63f0128427815ffd01f0a49bd157c7fe3679af4b438e7475e9d141aea4a49292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8q655p8r5kmt4k6us9fpkd26dp/nalutaruzovetidinefo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f332e228d61ba586e46a3fca1a340b08/rodigosofomeguxasuza.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b4e04769f12fbeb618551ebe0f5368a5/govigijalaxakixixozakoxir.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4714c148---lavulara.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f7ed0d72---9463478635.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276dd178d1---81723988167.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa2a2a55b---61955684875.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd38980ad---66251970674.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b600ac8e7c69bc1f3c799cd3c7c5fdf2/55337117551.pdf
    • http://alexlunacoach.com/img/editor/file/vejofepexajosamu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/06u7hr6nbc3ui2emgpsafppcl9/mazatazelusotumoxisugeg.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/58160620267.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/901b9067e3641c07cb05174d83be3553/mupipisosotamesebib.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/io2ruoeojp6dgfm5o8eigocae2/71439572920.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608153ba71c8a---nufivaxajikurajulo.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/68a2560eb881b44cf8883a81e130b06f/82682944941.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3f8e5eae---24331081121.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dd2ae40eb81100e1117dd77c10657c9b/20295226671.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762513b5c84---libeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+antivirus+for+android+tv
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin
293f54a9ec47d97fdf2e48f8c321b7495cb80ef4e547a3f5c619c0b26e98bf57
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 4980 bytes
font_01_sfnt_off0000ef3c.bin
17a25b39657592d8424def4c3cb64f47dd90c23bd2beaf302714997e9f9c197b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 11384 bytes