Malicious PDF — malware analysis report

Static analysis result for SHA-256 501516d6645c44c9…

MALICIOUS

PDF

91.4 KB Created: 2021-07-24 00:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e3a2401a780b52ea77fa8a924569267 SHA-1: b477b8627d59e63a0f4a9eb070ebea6f13550e39 SHA-256: 501516d6645c44c9100ac791d5eb27fd9448b2b4d6cec835db319b50dda51d2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript likely serves to initiate the malicious activity, possibly by redirecting the user to one of the listed URLs or downloading a second-stage payload. The presence of numerous links on potentially compromised or disposable domains suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tndvn.com/js/ckfinder/userfiles/files/jibipijagumirawuzo.pdf In PDF document text
    • http://eksan-ltd.com/userfiles/file/56552333992.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/n7mnquim74fsh4t7nl5vk5dcss/67037469675.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/04be82e884846868814671cfa8cdc55e/tebatotero.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/supefoke.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/1388685152.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/335c30c8824fc742e054f89e44c465a4/2901502206.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160970112613b3---vobir.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/90856778240.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/95032934720.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/pazivapudofuvabodexe.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8bb80c874df441653f71e5fc8d9626db/95370172383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d03625b5---fakeriwivawesogasoja.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060621181473499.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b94d1af1---77897976062.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e394fe79f8919994e4e83b9a75ea44eb/69697577213.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d944c69295---28814019939.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd557249b---65561562075.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecebaccdaf---sofopinigefog.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609839d51b4f9---37152704916.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5794ad17d9d9db91e2b9176785c72dab/lojelirolu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8ca400fac3b3d18a3e47ab5989bee7d1/kiwek.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/15075225345.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/638383376241afd1436daaf52443f4f5/zibazavalerukoxigi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e47589ee---nazovesolu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aba5918ad0020110ac4494074a4b4bed/46072242481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+slope+intercept+form+from+one+pointPDF 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_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 17796 bytes
SHA-256: dc9e5afb55a27732a484c561df1243863a38c976327bf05c6192265ad4641601
font_01_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 10736 bytes
SHA-256: d570f96556cfffad8c576d31054052fc33a8b33806a6d839bd4b5086f061b2c6

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