Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4358ff5c30d72a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76d3cc51a20bf93fec788f6815f9bae2 SHA-1: 54f8c0e05506700410d607ebf858f3116a3f9257 SHA-256: cf4358ff5c30d72ac50cab9a1f054977fd7ac104b9418c4576df2a24328ffb1b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites or for SEO poisoning. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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 http://seattledesis.com/fckeditor/file/bilawipag.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tasupedel.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/75916686899.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a067a4e7bc---59839581317.pdfIn PDF document text
    • http://cycling-software.com/files/file/xipokefosexofizijo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tefixulategaxawu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8os5epuhudedk9f96le09agcpd/92450768773.pdfIn PDF document text
    • https://websbag.com/uploads/files/29180281093.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/milixupifuzejove.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/ximupivivibedogo.pdfIn PDF document text
    • https://pecsikult.hu/files/file/76459765971.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/nisepanufagifunepixef.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/somapamex.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f76e326c---gozifasi.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/75824501572.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tejuta.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213211874b---7068181408.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/rubaj.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/rifipesobonirazadakovozos.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/lenaxobokavi.pdfIn PDF document text
    • http://eva.am/files/c9561972d3b4f34f.pdfIn PDF document text
    • http://ewtch.com/upload/files/gexogom.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7osoed7vd3nkropjvcrpgnf1k0/kikoropinefikifirotokuzu.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9939261104.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dunaxuwosowugatisujumujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+dark+side+of+love+1984+full+movie+watch+onlinePDF 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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 11552 bytes
SHA-256: f48024ea47791cbea3d1f820ccb153bac58f87d0129f92946652fbf7f3e6966a
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 17912 bytes
SHA-256: b8f0963aeb11cdd023d912aba95d5e4f73045a94ca232d0a85300d7b0f3353e2

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