Malicious PDF — malware analysis report

Static analysis result for SHA-256 485960e5d89ae5f5…

MALICIOUS

PDF

88.3 KB Created: 2021-07-07 14:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca020745fa7d6603a90bf4ef961f1aa9 SHA-1: 82d59e840323a5e1c4206cb8ba00586ed1be4d95 SHA-256: 485960e5d89ae5f583fb92a6a6a55120da344810ebfe12569d10b43951c6fd08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.anjhimayath.com/upload/file/xakipomewaxugebibeduw.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9557c41e3fcc85481f679d2325010571/mopoxarebebeguzarexijum.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bd546f2a27d---kekod.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944bcfaf058---koroza.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8974e22b6c2fb6a3d07aeac48cb0f2bf/belugoxedevedoxelesavu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0948fe9f22663a0695ca884c6ec025a2/23281295.pdfIn PDF document text
    • http://arslanemlak.com/E/file/51907143693.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/61288884488.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/zuzewonewodubupuwixewemo.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/xemikaxag.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f4a64c20d68ba0daedd9eb5f5d662a36/kavolisolodunezozuwubozu.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/namoferulak.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kc4s3h0lmdshvga5pcp0vghn9p/fagujekir.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1299acfb84---fujevugemofepig.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12afb8268---46208936538.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/26721139066.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/neoqdrmi50eqc333r61b5cqmc3/50572371048.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/vumanejudaguleker.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/93151515050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=taurus+605+poly+reviewPDF 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_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 17584 bytes
SHA-256: 4b0f648721442dc85779a99aa6a9bc6373603089701da3576c4393254aa742f0
font_01_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 10796 bytes
SHA-256: f583c4607424de54362878cdd250987d15c9a3423e02dd16ecddfb96bd913c55

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