Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e780a7dc989f4a2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 01:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c67b4a6f9a083d649aa2e3fdb46c7932 SHA-1: f8d44159f59b2b39052383e4a48af95f569e5bf7 SHA-256: 5e780a7dc989f4a21458eb746d32ac58a469e7a932f60477e817e6cfed38a337
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/699eb8eefa106b1e11a1f5383c1ad5cb/xifivumedo.pdf In PDF document text
    • http://cameragiaminh.com/upload/files/23631912788.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f742f864e9bca1b710a3180aebcc22c9/32601069192.pdfIn PDF document text
    • https://akconta.com/uploads/files/21083154782.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/07876b7b5fede1df8b08717eebf0fa02/78429736488.pdfIn PDF document text
    • http://funperm.ru/content/file/20903477801.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ol0lan9vff7m6e97iu58ug7eh0/kuzegegeluledanewurafi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df6d2a42f27---wuwisipakenazegakajunan.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5tlkf2obsqt33mlf5k1a0tq1d1/guwobikedes.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/saxalebojesudu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/watakenurifitepixadiv.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tipoluninibukodatuxul.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787cf7189ea---gesumizefefa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804689c01d0---dilugoketaxok.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/vaxitimiwugumor.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vk8jlea4oavq6b52jjnbd00pl3/katazakupobadane.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/37483537696.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210817_08B9D4D47C160FC7.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95149916136.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5jf10170qe5j83f7jc6iahtp92/44786955085.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/76806960371.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ea6b6ea65c1b482cbe0b25c6f8969d53/pagomizob.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9580289b86---gatipanoxutufodawijix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+da+resid%C3%AAncia+de+cuidados+paliativos+pdfPDF 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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 16036 bytes
SHA-256: d5164ba202b4258c9aca9ce2b34054321d2833ecb544959292e25534d6030963
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10932 bytes
SHA-256: 742c9e7caf321dbb1f17cfe1f6e8dbb8e4e4a8cb70e92b0f7721249301943530
font_02_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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