Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8222505fa2724a7…

MALICIOUS

PDF

94.8 KB Created: 2021-07-06 03:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0534ee5f1ceb28c15c9fe4a95718263d SHA-1: a630376c03e1654e51a435172a118713b8626089 SHA-256: d8222505fa2724a71277e45f1b01ae3c2fb136b4fa9a3eed5647f3b05a97ec9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://crysiq.ru/uplcv?utm_term=conjectural+in+a+sentence PDF link annotation
    • http://casinodanmarkjackpot.dk/userfiles/file/6365009497.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499a787fb6---17244441806.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0755834f79---47279190886.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e7d8b11e---67873760017.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/89104001015.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d556f6ace3d---novomeka.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608502b0ae100---51121244149.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2tj1m2acv77vomt1uqvh626ngu/kefusekevikogik.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/84878465144.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d38f431c959cdfc340e516e0af35535/92522771504.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/sewowomitawotoranegu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/26r2kni7tps7u95q8ra9idj6d1/95781495979.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/47603929953.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/91108570729.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/99d7e5fa7037158eeb85b865b2b157be/zamobulojedixanerefavor.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/22227003606.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efc82cf91---mogupidebom.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/jomutum.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/66169653177.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/filejamagerowina.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/70541610197.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d7ff573839d27f4d228a24e22ce33072/gaxisejitugaxifaditekike.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/beeefa439a16ba893840ba9e67400045/97153776468.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c84235dcdb87234dac1da7c492a9109b/safuwikezitoxefibatutu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014cff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14CFF 20188 bytes
SHA-256: 81ff06e114a67e49891777c83e0f661e4450b80efec968c1b19f73dd412a6653
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10484 bytes
SHA-256: 7307cccd531364a0025d75fef97e95802fdfe5eb4d4e532d17434dd94ad2d4ed
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 17260 bytes
SHA-256: 0288ecca267be4f485532bd34e0f9b21dbdec4519cf74db23a26ff95a3a082ff

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