Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3a7c063d5098dc…

MALICIOUS

PDF

83.6 KB Created: 2021-07-02 00:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fd97255a25ea53977dff3bc64af26d8 SHA-1: 6e8c670813a0dc28f978f744e360ae9f2a6cc085 SHA-256: 7c3a7c063d5098dc9ca17182276b8aa994e4df9b1a9c51c051c2a90fa789787b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a phishing campaign, potentially using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801744d19ea---32530987214.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be66cd731---67966168004.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wosezaneg.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/buleguxulazugip.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e8c833d0---xukafasejakukevenogoxe.pdfIn PDF document text
    • http://berbun.com/user_img/file/18647324883.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/tivajivi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a98759f34---52160542345.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/85512762677.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/46542562430.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5fd3c81c2---gunibowidinolapubilarakep.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7a633669---bepisobegidukuwovuremujon.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9lgnfpv78k5r5f74rrdk87mfce/87135621534.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/31816461781.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/10195408653.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/71264923073.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/dedemusigasobera.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff13248c1d---sazuforagofaj.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/66654255124.pdfIn PDF document text
    • http://93564497.com/userfiles/37633161160.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac652d5a376---34807464560.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/082f150c6b94b04365b8dba7466f4eed/zevisovoxaputabedesetos.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c90ca0fe---56427463121.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b1db1019e1a911da73c04a2c0d347eed/weziwefu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wavizifubulozedupoxa.pdfIn PDF document text
    • https://ka-base.no/images_content/file/99959639758.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094450d87d30---zadebotezijafexidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=creating+the+constitution+worksheet+fill+in+the+blank+answer+keyPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16636 bytes
SHA-256: 107324ef44ebcb8194375f866f02816442b8434b4d677131be038ca1ad8dfec9
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 11176 bytes
SHA-256: ac6e99469538a2e176fc432340d682de278189911400c8cf11bd638ae31310d5
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1