Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba2e83ba5fc8177…

MALICIOUS

PDF

84.8 KB Created: 2021-08-05 15:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00beefc20fd3afd8c50b9e0e6246a58e SHA-1: 0e3c072cf2f3d5706073cb7c56cde250f46cac17 SHA-256: 1ba2e83ba5fc81779e71caf1da7af0794dfb296fd680ca4cf7462b863dc39dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to URLs hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. The file's structure and link farm nature suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/mekewudebafupide.pdf In PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/wifufexiw.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/55503213270.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/raferopukowiputefivox.pdfIn PDF document text
    • http://jarosi.hu/files/file/22306847948.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3d7c5f54---xedan.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0953df0ae7---jaregurixevogid.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/92159017471.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c28879fe21a8a660c8dbc07fd754153a/jebixuximel.pdfIn PDF document text
    • http://1careglobal.com/upload/files/jujawupuvema.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061605173180554.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/54262916560.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/747f4a0bedec27aa1287a72870723653/vufitu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/272ef3ce7d9d73251da8b9863071dd7e/66679035111.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///8300930919.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/jezewotuvizifebi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/89246878070.pdfIn PDF document text
    • http://sbairs.com/datas/files/7928770972.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c13e528e1b1319b7c05148c5195accc3/nabefafukepufewexexumegag.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/583316e2243561c672a64d71422d51ae/87019508227.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0084345ba08a89f6b81f72e2f95d7fac/nesafumitedobakinaro.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/dudoridodi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1e7aa742---5148014916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+handling+hazard+identification+and+risk+assessment+checklistPDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 16604 bytes
SHA-256: 590068039342d0c032b489ec9b489fb4c03bafa964d61c01954946e659a33817
font_01_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 11168 bytes
SHA-256: 25a8ca12103fc6c7731265103b9251195acfdc296785aa2b78eabe6e115c6552
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1