Malicious PDF — malware analysis report

Static analysis result for SHA-256 9186b174b0080da4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 07:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd60fa15038631e1fadc6c36a76a1a3a SHA-1: 159f26264ee40335f5bf3affdaef85dbe7ba1718 SHA-256: 9186b174b0080da4d4568d60ec126df5d3acf62f10b09f065e36bf4fc653605c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=prefer+and+would+rather+worksheets+pdf PDF link annotation
    • https://alohasafaris.com/files/gajokazuveposobaxofupo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ohpg4anm4r4f7vadmp2c1041c9/nuvujozopugakeki.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/15322257811.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wifunubasitesisavakajopaf.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a8d86671---81241627855.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/pexomoru.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/fexolabesotuluxovunupar.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/72758086584.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4c28ad2f3d7b44bd36ca531e943091f0/99987001310.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160967bfe59c50---fajakejafowetaf.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b319a514899---18516352702.pdfIn PDF document text
    • http://rivucota.com/upload/files/pelew.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/21090808153.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/32653041281.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/50823058156.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/9899839956.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/33495764649.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2976c521357e715533c446438a72aab2/newafikenuvexolejoru.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/18398949068.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/vexev.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/gonifakovevixojemubug.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/28031670532.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26543d0dee---nipuwejukaremekep.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/16653318715.pdfIn PDF document text
    • http://aven.su/userfiles/file/nejalufipobi.pdfIn PDF document text
    • 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_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 17504 bytes
SHA-256: 22d709863bcfaf94c0a16e979fe3a0f19b4af96a485c4cf274edfd45a1aaec33
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10784 bytes
SHA-256: 94f8f3f1dc651d13dc5e037c255ecd5562fd1f0786908eac21e24fd1d0fa5600

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