Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aa4d1e027ffc05…

MALICIOUS

PDF

76.2 KB Created: 2021-06-25 01:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d0e1661270d539a0db263d27ed1a60ca SHA-1: e303bcda5702646f30bc13bc31f61d174048e4eb SHA-256: e3aa4d1e027ffc0517434f511194f5170bdb3602f7dd4db81bd4193d87f79faf
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://ckrestaurantgroup.com/ckfinder/userfiles/files/40700158489.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e0d517a4---29449039678.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/27910898607.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609128a4568f4---13462399857.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/midirezezuwufivena.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/muxozaj.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a7d3g50hcopq4l4qdu048h8hv/xomunuvavedamebibowoli.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/af0oiqb789opgn5db583745aqs/sulowubuzozupid.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d870f1ffd---69351567889.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb474388f1---xejemepijabukixil.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3e3aqonm2241gl268jumn3d942/nekeboropimoxobijogar.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/83ef1c0b6abdde15a0fd6e6f6cbe2a78/fuvupo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/7405663300.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/refesitiwulidaviju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=charlie+malayalam+subtitlesPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 7916 bytes
SHA-256: f3ab0e4d55b5834cc4bea6d366112cfde16f3969bfd3b2e87d79952e2a479afb
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 4032 bytes
SHA-256: 0889862b27db6f16b93976eb66cb8744d0b4cbda0195e93c42d6762382b7db91
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 4856 bytes
SHA-256: 2c2c619841c27752456b35968ae79a851917247a3d744d208f0c124ee5314070

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