Malicious PDF — malware analysis report

Static analysis result for SHA-256 89beab1de0a2b3e5…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe263ede607966aadbb00780785dc4d4 SHA-1: a53c01cf3081a99e9beb1549e394e378375405b9 SHA-256: 89beab1de0a2b3e5c90ff8da0453a802dc68205bcaad45858d84aa7439d50d9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains embedded JavaScript and numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=the+x+files+fight+the+future+online+free PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c450ae11d---25793979406.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60581871967.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/3729206910.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/40426378469.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/kojabaramupitisowas.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/xuwinew.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/pumot.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/df89t98j0dhibhmolsqfk9dv3g/37540055098.pdfIn PDF document text
    • https://asi-filter.pl/files/file/bakuxovijigixi.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/48481785641.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210919_04DEFBEE2D40C637.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/34462103979.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/rebebid.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/katewalofez.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/85173710546.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/52100905259.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/35908158491.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pesujimifuser.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/tevunajatonomumeje.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/81797333265.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/60320562196.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/petaxiwuwivifijufomu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa68e1c2d---varowalupudijeben.pdfIn PDF document text
    • http://markone-tools.com/upload/files/46550133689.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/53114070870.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/50956708233.pdfIn PDF document text
    • 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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10496 bytes
SHA-256: bd0fb232c406e4b08c4b407ca4a1cc8a6c9977968f12d8f6f68739119743cf24
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 18224 bytes
SHA-256: e1a0819e468329308465c62dd08f31dd1858d5dbe1aa395d68ef2c959da70531
font_02_sfnt_off0001389f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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