Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e7398436e60364…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 21:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3b0242d1f2e03e569c8c3985ff964c29 SHA-1: f080f043fce3790e035c438a0b6d1504ee892690 SHA-256: d3e7398436e60364dd6c4b65e0798a09f6cf1e941c676cc4238649d5e06b66ff
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 0.9913

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f117fcf3---buxab.pdf In PDF document text
    • http://namkhoabacninh.com/images/files/gusivesuz.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zumirejepebedijimibusigus.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/sisuwapemudezowulupila.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/40036028660.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/85542436788.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40947375386.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tixuxizopafoxosave.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/libujurojatonamelojogotop.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pokenosifaporubuvewob.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0sm5c8t58elid7elrbiu5kd28k/tatogezowetogeno.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1ecf69988718c5d24ae9ad94fa5d8b5c/78601520093.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/pakemuti.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kijozudisa.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/pasivepi.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/19433845744.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/pcp8810vg839hdri63s1coprn2/10833237954.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/69920303680.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/35090597100.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ad2978a4---dekoxakagujixut.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nibilivijalojexamu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ttt6i1sjehoauvf4ckf75f4gp0/vafagonoxas.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275a8c29b9f---rulujimoguruwu.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/8537750400.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/xufunulogomesilukaw.pdfIn PDF document text
    • https://inncredel.com/uploads/sotajugubavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=onduleur+apc+3000va+pdfPDF 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10620 bytes
SHA-256: 3b0d0cf27c60fe737f5b970c8a73e4466fa1baece1ff6737c85076a3e6fd8d50
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 19192 bytes
SHA-256: 46b423ae1ec4ac1e4308e1a98c0cd6a3690396c04b3588c71a3c1d6b70bb0038
font_02_sfnt_off00013eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1