Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e63ae46cc21ded…

MALICIOUS

PDF

76.5 KB Created: 2021-06-07 16:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5419365570e8edc4508405a96bdf55de SHA-1: 84d8fa75ccf1435f4aa54306e2ad66fc100eaf03 SHA-256: 17e63ae46cc21dedc35d03f5fcb17cf5c3fb59ed3a25573e12f8887288a75907
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's content, though heavily obfuscated, appears to be a lure related to Windows updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=%25D0%25BE%25D0%25B1%25D0%25BD%25D0%25BE%25D0%25B2%25D0%25BB%25D0%25B5%25D0%25BD%25D0%25B8%25D0%25B5+windows+8.1+%25D0%25B4%25D0%25BE+windows+10 PDF link annotation
    • https://mclarenquartz.in/ci/userfiles/files/zosem.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1ab96788---ruvaduz.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/nodegodizilu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5f8f6862dc34542b8cd82bbb8a4aadb6/dosowemuvoxig.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile/%5C/xetezomevizom.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/14496157064.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878747eb343---nimizemusebokezonaxarufu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f8343dfb---88869928081.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/49532072878.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b5aaf0043aef4a371ba36f18364eb8f5/86103632858.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d1450c69b9641035831a2df52a95e58f/37161963800.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6cdaaa021d---jarurolosimisu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d443b251c0---romuzexiloma.pdfIn PDF document text
    • http://amandamaitland.com/images/file/86024568139.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d8e5deae---62910353447.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68c1762c3---xijopifabebizudumujalewux.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6d71d5cd4e1936bfa91a6e002175c059/fawevu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2c6755609413dd3f0f60a1d84666de5f/mapumosejerobuxovakubif.pdfIn PDF document text
    • https://maisonforville.be/documents/file/netavajoxupewudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5876 bytes
SHA-256: f7bf6db3053df1626ee783a81b81a4b3ef4ebea315ebe154f7530028a47b4757
font_01_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 14572 bytes
SHA-256: 79b7099adb91d0042a93e157a7d081bb49af2e2d2c3bfd628adb117b541a44a7

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