Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa7f03061d51332…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 22:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62d337f240307572560844042aec8be6 SHA-1: 3d0afed4a30bfba5d9c81218db4d6c76524cf9c5 SHA-256: bfa7f03061d5133203684197c781417c5b408fd6642975157a209065f1a7d2be
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dailyiat.com/html_upload/file/45525222302.pdf In PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/rokusi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210919_07769EE1D888BEAC.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c34181c21---18581243983.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ea337ac3df953d3e25079f02d41d471e/14192148633.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3587e6c7---79430059492.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • https://adci.vn/data/upload/file/77245028752.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b5505f40---zerugo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2f3878ac---50019070055.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/84101417084.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/35235771930.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/83187203272.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kazogiwobajut.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tukisurimanaj.pdfIn PDF document text
    • http://12shio5.com/contents/files/76755123991.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42954415565.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/16600288057.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/35912890225.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nexokisaxikawudofinu.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/43830262160.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mabipovurovolupeker.pdfIn PDF document text
    • http://lejuriste.ru/files/file/68239509868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=memory+booster+full+version+apkPDF 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_off0000b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 17528 bytes
SHA-256: 1c486c0a69935ae452e5837613ca31ac77ca6837c3ef5d66e6822e231d8bab01
font_02_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 11024 bytes
SHA-256: 14bd8cc258d4a717f12ff4c4fe9c6302251b3476eb0200b08e6d189834d42dbe

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