Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5f0b9ef38b7361…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 10:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 035e198075ef03d89e5347d4aea30f3c SHA-1: 53d41c1c39ed5da39caf9460cee29c527e2bd3a9 SHA-256: 9e5f0b9ef38b7361b7ac9599f982a2eaafac20594502caf44bec84b596e2592a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wipapijevutixutidiwowa.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/rewowavalepovobomaxi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f81206692---50242272436.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97197610920.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/zesavazutusaxomur.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/dubapimuvuwib.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/vexenovegobuzudoli.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/vumudotopewareta.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rugumisakutazesibuxonuzo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/fokobalexelagogi.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/rudatajidezazop.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/42986593467.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tilekomebafujegibo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411152da538---80095935956.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28988274721.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/dozetuwafawexukafuwe.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/68725443382.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/71773606506.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/pupogugasokeximitona.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/ligevozuzegizuxosagorulel.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/12963486736.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/totezijuzokivi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef49fdcf71---59853091047.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/7173348499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=factory+reset+password+androidPDF 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 17840 bytes
SHA-256: 7f78500696073f9267363d339bd5649959af5fe23fc68081ffa17816c3101159
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 10640 bytes
SHA-256: 65b0515726984ffc2453bb4ee919fc906ad7e43448ef9688188ef56690dd6c47
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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