Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1eabc107d1c077…

MALICIOUS

PDF

102.0 KB Created: 2021-07-31 14:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a4f4503c82920e7d1e3582acd975b60a SHA-1: 36b3c24dd4d806874302d0579b96cc81c1e411f9 SHA-256: bf1eabc107d1c077ad94caab6c28ddb04085efa56cf321cbb566a2ecd08ec024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9970

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 http://nessium.fr/userfiles/file/68306628174.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38628ab12c---zutijegupovuxoxomikadif.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d36cfa2469cbe6c664021a99d3b09067/nivifidobabidodad.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/verodatibel.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca91ae0d7d---52660658024.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/95886843425.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/af16ffbde3c51972812c80fa534837bd/dopiwexado.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f16c4051e---80186688418.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pefufemezizugaxeberajol.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1325e89a---kuzebapomefu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf17ace26---30668784956.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/34739126ef2d5bd5ab372d67305e8a06/zotupuderizitivor.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/pekiwunop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/673428701be61ab2f68885922cc1cd11/jabazakevagixus.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fad70d4f---xataropuxiradonetoda.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085362093318---67222738308.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/40971194568.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3000e6970e---6899661996.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lazawemefewajoribefuxikaz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5hefjdkg4bpvehm9brqt3oqqr3/23370576625.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/narigujusidewuf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b204259ee---tegigulezafa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0eb5f586---kuferagugodebudifuk.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/97435335829.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/60844809281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+fix+an+unresponsive+altice+one+remotePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 11240 bytes
SHA-256: 294d526d9c876d8222f825d629ad6b924bf09ab51bacd3ea2ab0b9b311cf82fe
font_01_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 18332 bytes
SHA-256: 85edd56429ce4069275c6857cb8409586ed0bc88f57518ba4dbc2c654fa7e123
font_02_sfnt_off000170c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1