Malicious PDF — malware analysis report

Static analysis result for SHA-256 7690e9132c3cf03c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 19:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5200739d7ca8e73ccfe511b981faa00 SHA-1: aedb0eee14dcf00fa1327aa975821884fbb85fac SHA-256: 7690e9132c3cf03cd458efad5b508ff92caf8d58d23b0cbac300e6ea4fb55b9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kuresi-kaitori.com/upload/content_pic/files/15310407444.pdf In PDF document text
    • http://teormech.ru/teormech/usrimg/file/tanaxufivisusade.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038730476a7---derowixajejasifukiwa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9f102622f---ridizev.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/76340081331.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/62864712405.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/derirevoxegaxetiwipem.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/vosapefuwisatezofovudi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/9246183811.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec85356dad69731adb8ccce6186e2a3/92940287658.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704319842ab---92401343546.pdfIn PDF document text
    • https://digireg.pl/upload/53365257624.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/kibadad.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f111b9dad3---jumekid.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a43764d1640fcb24c1392e8f9f313092/97755753786.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98305a8977b9773961a49f6fda8c8d86/nutopakeligonoxa.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/79258706380.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd40768dc7---25620239581.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c3152e418860223ed36674894f1cd79c/pofodifogoxujafasikexo.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/wapuwuzixurimipamenotomur.pdfIn PDF document text
    • http://jarosi.hu/files/file/tikoni.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/semexikuwefazo.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/40266223260.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827611730d7---denopojadefajepod.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kewawilojadegenepefasimum.pdfIn PDF document text
    • http://vlajamo.cz/images/file/mofuriroridetapomex.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/40414144549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=regular+polygons+worksheetPDF 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10876 bytes
SHA-256: 3c07f46a866d0358d38e9e7be50753e5121e54ecac3d6f7e9584e0637d39e5f9
font_02_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 18760 bytes
SHA-256: fe7915a31ee84541adb0e0dffff1aed7b0b752c169094d6b63e1aabf50dcd17f

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