Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda820a8eb7fae0d…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 20:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e79baf78d14603edd6acee0eac163c32 SHA-1: b1087c62055f2870f1c433edc9f86d72afecc208 SHA-256: bda820a8eb7fae0d2e2f6e5500aab29c1fa0045baf41eed6352ecf1e5b9dadcc
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection indicate malicious intent, likely to lure users to these sites for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5882

Heuristics 5

  • 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
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4762b0275---44147473880.pdf In PDF document text
    • http://burchiellati.com./file_fck/file/risojipupopemejivazo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd31416434---jofonevazutopanadaroxiba.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408e42e18---tifikagupirefe.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i3iqat7gg5vum5es3rfe63odom/15224480285.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/26961835157.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b33d72ca8---kovixevilinizoxukufowe.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c540985ce5---jazereruluzenoluloxifo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4t9n8800gbbu0b2ufu0b0ubb4t/puresovuwujolagirevexe.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/28336050512.pdfIn PDF document text
    • https://12tiga.com/contents//files/mavulek.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lugumolululuguzi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2808fe79e5---75669152115.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bedojipabijijek.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6df49df07---lepojekixukodatanuj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/642h3u2dsvjetbhv0qore37u2j/kuretutajib.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/goseronetikavuzexe.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/bubenedadad.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa7c5468e---33809993168.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6b11c24---99879900115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mammoth+cave+historyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10516 bytes
SHA-256: 7161c8e6aa2f7c5f2c1ca76abdca551f36b949b8efb227593aa47aebbd2fadd0
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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