Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6123fe86038442…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 13:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43b18d674c78e5a146eb15cca646811b SHA-1: aa9ec68734f7e5b5389b9fae064db6e821f5ecfe SHA-256: cb6123fe86038442d39cf41942a845ed311d05181f6980f6594d78aa15e82c2c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation or to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+view+instagram+photos+without+following+them PDF link annotation
    • http://batterseataxi.com/survey/userfiles/files/27090818936.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/rknmihjcku1gf9330hmk5m30li84b7un/41835021084.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/dobuvaj.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/siluzaz.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83785021613.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/92504438419.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/28123083965.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/tesolefabexipegisepit.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/6206402236.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9bcea5e4---runifegusem.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/vevolaloguxap.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/32108379867.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nekuxawasosul.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/xaruw.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d664f300---70178938123.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/dapigoko.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/8308139201.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/mogojadij.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/95225633585.pdfIn PDF document text
    • http://showpelec.com/data/file/20210907_060626_385.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/81537118471.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/70261368369.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 17656 bytes
SHA-256: 18b05ca1c5167668188d96f032f430dd8aff32cb23b6312b92959402a4456bee
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 11048 bytes
SHA-256: f79503eba136ed8bed6a0b662ea295544c34022e0406744fb8ee481a2e605615
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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