Malicious PDF — malware analysis report

Static analysis result for SHA-256 f689c525cbaec656…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 10:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1a782728adff7c91af399b41af88b25 SHA-1: b5f0f5838787386107ab700c24bc3af935af60c3 SHA-256: f689c525cbaec6561f8602d9c9d55f4d0f5ad5841f33ccfa00b65d32a7f06b99
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://meyergarden.com/ckfinder/userfiles/files/zuxew.pdf In PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fujubokodasuko.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608182eaef835---sopakav.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/ropunudapajepenaporamunu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e713ce7690732ac3e488395c10c8cad5/67452683823.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vuveganulisedofadujimol.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be1d5f84---sumusejagazolibapibidapa.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/nizigisak.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/gilumanasidasasu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6vvhfa0r2ofsjnq0b4f76pa07t/tusafegulurapamisup.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/439f773d2323a6181e999d7057b50660/dagusufubepa.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/bepozulexidupunumorirub.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505111514856575.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/87vjrcj8guob0uftg5c8e5u08a/luzas.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098fbc141443---danulibuxuriwisix.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3709110114.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/21849619049.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7f2dfb369e471dcca458d215cd770910/nosemuwelijovulesi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6b43e5add1d12e551f6ce5bf72f2a604/jisirelezaloluno.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/kudidonofexopas.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/zobatofamiponadefexiw.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/54758339504.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/pijam.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/redugepevagobogexev.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc9fac915---60707083856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lines+rays+and+anglesPDF 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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 10276 bytes
SHA-256: c39e6b84a2feb8c1698386d9939d259018c427d9c3624e780c76bb10170bdbff
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 15884 bytes
SHA-256: f12835e5eaeca1f0fa29df1989f42c570dc8e05f1f9e8f38abf4c843a0c2534a
font_02_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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