Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31faf0c716f736c…

MALICIOUS

PDF

81.6 KB Created: 2021-08-16 10:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6ad6fc0410b182eb8f474044857f137 SHA-1: e586a1764acf25e5a33d7ab0459102a5133a3cd1 SHA-256: e31faf0c716f736c0fd4396c6b38471254f276702539aec5a2459b095ef4c748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 http://udemadriatic.com/userfiles/files/tirexoxizekanijigojogarat.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/ladodetezepagojuxatuvob.pdfIn PDF document text
    • https://viehomes.com/upload/files/5727959181.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ev1b1s70v6n23q0p76n9d5a5qi/vipufo.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/65039941521.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fdf5365362b9b97aa95bb6f2ed3308dd/39563925284.pdfIn PDF document text
    • https://btegypt.comfile/76109882481.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5dde70a2---wadorapevapokosorex.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/39645741854.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fc94e6d5---62147904958.pdfIn PDF document text
    • http://sns.hu/_user/file/26735186118.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/60037173181.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7r5s74l444ebs1dngakebq0bl3/zijanizonovo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be63725f19---52943036460.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rukemugilimemuw.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/gabotisijobinulo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/30817140025.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/32229791631.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/00153e8f2cdc04cac21b0849dcc3567a/81279237129.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3e08c87a---40852670251.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/17469284315.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/majiwuniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=template+printable+pdf+printable+origami+bookmarkPDF 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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 16476 bytes
SHA-256: 9f64dc14f31aaacfe1c35aa0972a69bdef1b4c9fcb7112e8f034a521ee0f50ce
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10868 bytes
SHA-256: 89cac70c7a9b968d4e776ad8a5f394cd31b14696221e0f43283fc024d1712395
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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