Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee00a2ef3d72478…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 17:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed7318e13259aca7de5ee1688c0279b4 SHA-1: 350e0a618915bd58e7ba8ca479f9f5f6ffce5f52 SHA-256: 7ee00a2ef3d7247853eb92bde2ec8d3227b63c4d7109ae4d4594ccc80a58ce61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://tavaszitura.eu/userfiles/files/85975358201.pdf In PDF document text
    • https://akemi.ro/hirek/file/mokujekonipoz.pdfIn PDF document text
    • https://fratellifurloni.it/file/40291682393.pdfIn PDF document text
    • http://dobermanncz.eu/files/xawotolij.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/zapojo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/poxowekelimawidafe.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/busuzemolupenusef.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/21574926525.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/26495e2786c5f40921d91a5049fbb0a7/samefun.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/77016051860.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/44161837326.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/zozanumepulekefafopor.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/73011762046.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/232558357.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313b83477a3---13104820702.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/80763946496.pdfIn PDF document text
    • http://hybsch.it/upload/file/60054497113.pdfIn PDF document text
    • http://harlit.com/upfiles/file/bifigegesofaluzoperar.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/94316585500.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/17425034435.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/rirogukigadujevudavirew.pdfIn PDF document text
    • http://builderall.info/userfiles/file/10372687147.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pisit.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2438363734.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2d422733931c0481c0dd8ade60d33cc8/gakisidoturob.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/witogila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=logique+ensembles+et+applications+exercices+corrig%C3%A9s+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_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 11560 bytes
SHA-256: dc84504c0d105e2c5b6c0d092b8481c6e21362a55c09544fa7bce5a53925b7d3
font_02_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 18124 bytes
SHA-256: e5f6e78cfab3997f4db34e726e285051e60ea0aab072dd361beb8a9be51846b9