Malicious PDF — malware analysis report

Static analysis result for SHA-256 72945a3c52834b53…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19def38e3b0d6607f1ea52bab398347a SHA-1: 5b2f54e768c95df2122014304bf4277a0cfc430e SHA-256: 72945a3c52834b53bd42e3a292211f01ad574fa742eab24ce35291ee5574deea
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a lure or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ff01fa847aa229ede863866f5d4beb11/notulorot.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c74696dfa---96085403859.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/totapotifuminimexegu.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/71564397720.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b7cbb706b3b3dfb9a424bde71cf86c6/gufokogavagixakijimoximuf.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b16d23fd85aa8ff4a1f758ece8232f33/70008665455.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/36157169584.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/60160668232.pdfIn PDF document text
    • http://goref.ru/files/file/bepelugimolaxex.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/28084086688.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/72356815146.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/mawipajogetozav.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/mupolazuxumafofo.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vuxonu.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/botijax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vvqt6j3gspbltbdatm5nmmfgnt/xavobubowusimowiferor.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zubogogopavozedozikejimir.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/19487878312.pdfIn PDF document text
    • http://lucann.com/Upload/file/7096182281.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/fobupojokirevizad.pdfIn PDF document text
    • http://labotinnghia.com/img/files/69211268072.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161137b0ae4a23---55047346780.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/06c71f2a6520bf00f3326116dd022d9f/4616485656.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/fuxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manualidades+navide%C3%B1as+con+ganchos+de+ropaPDF 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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 11060 bytes
SHA-256: 2fe4187978183b706096a63d29316c79c613b7ea0398b06bdaecff6a0c3aaf33
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 19220 bytes
SHA-256: 6b18ccc027f0fe2d7cfb620a439933b8819d1535dee593b1ed2cf4a6cc66a4a5
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1