Malicious PDF — malware analysis report

Static analysis result for SHA-256 1797b37b3c6dc9c4…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 16:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ece0b95e61be7d464b026533b1f0164 SHA-1: da5e4e8b5c599c601f5e0f03087e44fc0c840def SHA-256: 1797b37b3c6dc9c489a392d5e525b4bf9747cf85501bb883fbd0ab5635c38759
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised CMS upload directories and disposable hosting further suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://marinapogon.pl/upload/file/gifatej.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bukovuj.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/42274030992.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/wukurubobekiwiraditakogit.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972ba0658---14051257038.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/givuwipisofumufabarapanif.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843edb1789a---libebiwipuparewovupabe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cf98a13f311f5e85ddb0e146c2ae7e01/90049028977.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f98572a480---1774984968.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/jusuvomamagukebiworosu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xodoz.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/batejubizewexetazemebovir.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/upqv1upc85ofkiodtj28em42k4/xupen.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d0f1ba529---51801508281.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160709cf4e681e---63693340847.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7ac559ca8d6c25e605b57a4bc62be6f/xamewebelitagazarenu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4c27cf8f139bf92f2ebb116099146687/wovetozevuxovidid.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210705_083243.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zubagefosajelez.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7f33a57b---worekiwikomugejib.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdc834437f5e0446df2ae69f6bfefec2/garenuta.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gezoput.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/24457236246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pre+lab+write+up+examplePDF 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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 17256 bytes
SHA-256: 74e9531d71e113788401fa6664b0314d30b4b3a26a90cad580a5b81e3e9c72f5
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13485 10448 bytes
SHA-256: 1408d0a698513d6ded92ebfd1b1042171b90c3b72cfe3b8e0dc9074088af6051

Open this report in the interactive analyzer, or submit your own file for analysis.