Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a66348b34ef70…

MALICIOUS

PDF

224.9 KB Created: 2021-08-17 23:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61199c7d956d27973e0e32eabb502113 SHA-1: 2ff1de10271e9de9a709a9f538cbaa5d9731f121 SHA-256: 041a66348b34ef70dd96f0146f8a124b57b343c0c066f712448b6d5eeaca7d11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. While no scripts were directly extracted, the presence of multiple links to potentially malicious PDFs suggests an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8731

Heuristics 5

  • 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.
  • 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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nq8spka7u7fs576ktuib00c691/tanafirudu.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8nc53b03o8tnq25j2rv7p572o1/tijekesewijavekatur.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/pomejotawijimuvifafux.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20218922470.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c706d652e9f61d05b91026d6ab6fe772/lowosejexemivavo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/wufudobilozagitov.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/78718304532.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/ginajan.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00cc8084d---xalibejodavabadofoseb.pdfIn PDF document text
    • http://pvvc.cz/files/66486324166.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/45110116612.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gefokujedudezilup.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/18110056010.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9be032f7e11e59cddb1f9a4f79d250fd/doriwa.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pozudigifavi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/hq55nlp8s7d49u6nlpb2ilks31/zekibural.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/kuguwodatoduwam.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b327ff54646---9254287041.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vepavusedaxanasaferug.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/dibezesitukaxabemozux.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/73994810262.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/jejuxalefuratidu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wogukajimumopeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=examenes+santillana+5+primaria+saber+hacerPDF 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_off00031381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00032b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B93 18844 bytes
SHA-256: e6686ff4dfcf514f292c6f44c59ef327310f1cd33817ee87c019caee9499ee69
font_02_sfnt_off00035b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B9A 10880 bytes
SHA-256: e53a5fd643fa9c0ee9245e6fbb4a08a6ba94693b6fc5fc8aa605f21ab13f25ec