Malicious PDF — malware analysis report

Static analysis result for SHA-256 4499d70e1912229b…

MALICIOUS

PDF

99.3 KB Created: 2021-05-12 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc78b8a827b795ea1c01e5c343fad2ff SHA-1: 3392492cb09185ee765a7548a2b237879b875ed0 SHA-256: 4499d70e1912229b99f7b9b63db361f7777b1966eac5e3c3e513127f8c265ff8
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains multiple embedded links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of common techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8650

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://apoiotelecom.com/imagens/img_fckeditor/file/74448050894.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/53ab95357db9869eb2efc33540c97fd9/favibosomenewefa.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/355780f14f9de6b70668927f39258ed6/38792804939.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d192e31b0df0985a890f344b4fd89cb9/kevudukogepiwozu.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m84306rlst9g5p01ekg7p8icfm/tituluvafusogofal.pdf
    • https://hgb.se/filer/file/79630076042.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297593ae72---37881326598.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c4f80e0ff8ff0085e362093b4d46bfaa/samazafolage.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/75e821ad869529f43920018742e6b745/dufosidesakagosejezoge.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/kolasefakobesagibeve.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085041b93037---rusajamubefelurubovorafi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160848e916185c---lubogebozopamawikinusi.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/613aed53007cf8d03fcf0f2cb471583e/fakop.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d754461bc6---26918243278.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bvca3isah7phdudla6hdam4kp0/60403458080.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bhagavan+kannada+movie+audio+songs
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014809.bin
987cc36b30bdbac2736a416aa29a18a3f94f28b61930a45ee12bb68c7583262c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 5284 bytes
font_01_sfnt_off000159ed.bin
1b6a719c77760ca5f7a4d2bc0a21060867c3878295abe2bb666448352dfbac38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159ED 4844 bytes
font_02_sfnt_off00016a82.bin
aa434d17baaac8bd981c9dae6cc94270b80e0aead3b8a409d1355ac9bad3a174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A82 11624 bytes

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