Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfa316a51d033da…

MALICIOUS

PDF

96.5 KB Created: 2021-06-27 07:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dcce70d5460aa4db6b510d56a70cda7 SHA-1: 71e9519460d56822e7f657faa3d1b0798a4b67c6 SHA-256: edfa316a51d033da1aea7203483b926ccaa9da125ee6987f44d7e1b87559584d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress installations or disposable domains. This suggests the document is designed to lure users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://a-kamen.com/userfiles/file/vugefakafinalazeku.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f910531e95967c50f81a683e08ea143a/67274967229.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a413ea1a96d---68046475481.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9c7cfa0b9148435af4c63c76b6afcf29/88924239598.pdf
    • http://gsxr.hu/userfiles/file/kutebekerajelifazuxixufig.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95a28fb37d99785fc13286feebbf42a/69610209680.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8835e78ea56df62f362cce9ac1337817/jaravuwisaxejinuwaziwepo.pdf
    • http://laclonghotel.vn/upload/files/wilegalavawasuditupefupag.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076e63be063e---18359100040.pdf
    • http://albarossa.jp/js/upload/files/zazamizosaravuvewipagog.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4481f94a3c00fa2cf982b88d20f6c505/62861382150.pdf
    • https://istanajpdua.com/contents//files/nowuwagamegawifopaxivodog.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baf3a5f053---57504927332.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/79eb16fea3f44ff3e575108d3bbe6bef/zurojejevuke.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085863d640f3---nisujukotexenunekozuf.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607787e825314---94843043975.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e2b6e0170626c0ecce9ddfd37b0eeb06/zaxusekesadisojemodunirof.pdf
    • https://balajitutorial.com/admin/userfiles/file/lifujiloz.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9d393be6558b1018cb4805990f2f50ea/nigosomopupololafulex.pdf
    • https://atcotourismtravel.com/userfiles/file/83169612223.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/84549652752.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ec4386539---62486593400.pdf
    • http://brenna-ski.pl/userfiles/file/97871825803.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607842cd64b81---9134275960.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=global+warming+photos+for+project
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
font_01_sfnt_off00012e1d.bin
d9dc45bec26c8d1799d6923cdbf68f22caf8dbd1a557dae75c27491d4af89568
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 11320 bytes
font_02_sfnt_off0001485e.bin
8336b91ecb7d7b15ff22e4e5383857ec9fce9349f6ac1f844795b7afa2b909d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1485E 17036 bytes