Malicious PDF — malware analysis report

Static analysis result for SHA-256 991f336cd93b78a9…

MALICIOUS

PDF

95.6 KB Created: 2021-07-08 14:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d5fc7edce16849d4d0785a6d0e30454 SHA-1: 07642633b8cdf132c388853e7e933177953ebab3 SHA-256: 991f336cd93b78a995eaccffaadb2acc63a0dce7289b646cc767c0bc2b71e5ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of malicious intent. The primary function appears to be acting as a link farm, potentially for phishing or distributing further malware, rather than containing executable code directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.tobywells.org/media/fckdir/file/wozuzedupaporumuruwa.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094202e95262---vexaletijapelovosubitezo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0acf27be98---dedotexalip.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/995f1c06014fe871bffc5bc0439c2aac/20187121179.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bcda8aaaed0a41c150b55151e27679d3/fejezisamivuzonapasawabas.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detofekupomijitopoji.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e4e07796a7a9d8e77634efb30afd5348/69466356708.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/02ee7d5b1bfb24d7dd71bd323db918da/38142138486.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6pv8bumqibak84akspqhc8gss3/sedevodif.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7162b4dc---63333001836.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i36igagqok3qs4p962g77adedr/81511915341.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10913612278.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d587a1a2b---komakejidu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cc0392c5c---dulofet.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/98947276647.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/27092191622.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/42762423517.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/14065549429.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/60763717432.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376aacf3a4---13030022060.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ebb9b23c---jebuxufixuxoloda.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/lenowikavuwamamineli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=language+and+reality+an+introduction+to+the+philosophy+of+languagePDF 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_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 11072 bytes
SHA-256: a50064f1f1646608362105d2afe3655b758c5d224d24e2ed5045c36565c6d0a6
font_01_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 18868 bytes
SHA-256: a0e34492c006c359ed2ff488af6c09db2c0bb2827cfc0ab44f77ea10bdf1966b

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