Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cecb4842f9f3a42…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 14:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd7002a66b0a14e4222ce166d71c30d7 SHA-1: f7d6c383e9d4f480f17d54c3428531f985cb6d73 SHA-256: 1cecb4842f9f3a42c3a01f729ee6f4c119ac4dba41dcfa4c6b99efac605725e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. These links appear to form a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gedayapi.com/userfiles/file/27660515091.pdf In PDF document text
    • http://chambres-lannion.fr/userfiles/file/wilizowul.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/40438729431.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/gijutotezavebu.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/89922373287.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/93534753168.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jujitagevin.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/mujizuvunisel.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344fcc10c20---nerubukuworotal.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/53683740616.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/1670780008.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/20259994889.pdfIn PDF document text
    • http://artio.pl/files/files/babugetajod.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/likekezuxarixoromano.pdfIn PDF document text
    • https://nomortiga.com/contents/files/ritibapeguni.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/6095090480.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3c229a30808e73003eea69e7ad15f215/dimonav.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/fc26af20b394ed096d0a69ae710df6f8/doloziwudojipaleba.pdfIn PDF document text
    • https://felicityokolo.com/file/1123749081.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a938ee2d83---xajawunabaxogiwabukaxu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/60145871498.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/20070564150.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60032543360.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/91676553419.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/14648563464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+vidmate+app+for+android+latest+versionPDF 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_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 16772 bytes
SHA-256: aa8fe64084b9c097451807f5ad8d2aa640d834223b8434a2c08f0a066949e827
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10812 bytes
SHA-256: d7fd4e0031d5698cf82e9e5ad80b5c295f726bbeb403d5c8842ac44f5a55c27f
font_02_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1