Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8bfdd4799d092b…

MALICIOUS

PDF

67.9 KB Created: 2021-08-20 10:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c7ecf4a925c5bdaddd03664c3051196 SHA-1: 9626702237a912b35c3b86726cc40c20c0311450 SHA-256: df8bfdd4799d092b1c210d8ed24dea6bc9f983c7798d251d5726478399a6a719
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a5d69d4c---guregozivakajepuwu.pdf In PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/64604302552.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c0387d5e---pojebaxiwa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zalejok.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d98756a---8616068194.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/465e0f9b81f9dd57aed2cc0c2d99a8b8/4404421066.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cd6cbc8b167f0ec0b9cc535d2391fb04/59196180391.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160776221830c5---7864219980.pdfIn PDF document text
    • http://bscartridge.com/pic/lalizezuno.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/79f2dc5d890e370bc868995933cbfdec/18739142105.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/kilegatuvexukipidiz.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/kovawasobatoderojavojidab.pdfIn PDF document text
    • http://3sdent.com/upload/files/51631410026.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/mijibizimogoditulagepemix.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6fa914c87---rixisu.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/bidexivede.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04c50348c---ritajijorafebefuvafujupo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/naxesufemuzinafemapuguba.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609216008c44d---30915388652.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b6d59141---sepowemikaji.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/39479601354.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ec25ef70---87182642869.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n738q8nflgc6p6m1k1eo166k48/finatalofipolevowokobix.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/28757752413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a6+tws+bluetooth+5.0+earphones+manualPDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 11220 bytes
SHA-256: ede74fabe01dcce2ebdee58e62b9218c3d36e3fd75cba82fb12fcac5828561f9