Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb6aca742856c91…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 22:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b89d3d3dca50620706336d63f081cca4 SHA-1: baecc72b2595c5594ae9f4a0d6ea3cc7d8f0ab02 SHA-256: ebb6aca742856c911e687d93a289095d0ba6b82504d4d3a9a2de7415cdaa22cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allytemp.ru/uplcv?utm_term=common+p+words PDF link annotation
    • https://hometutorsdelhi.com/userfiles/files/lekaduk.pdfIn PDF document text
    • http://zamgph.com/uploads/file/092046523254.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pokarigiju.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/6353707875.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210907232426.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/80842022338.pdfIn PDF document text
    • http://electric-kernbichler.at/ligopokafevabu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613613245953b---tanopogufuwivepomag.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130711920065---67588002270.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/relusaveminukutozinuba.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/lamurekoposodiwozumisik.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/mesiduwudatugajenag.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/34071022781.pdfIn PDF document text
    • https://webmenuplus.com/images/file/bulejugupobuzaginiwejavuj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d22079e1a---febavofik.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/remiwaziposej.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090205352840.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/latomag.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210906_33690E84D8DFF134.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gr410u51gb0qjeivs3q00rh0um/75851325079.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/15059151663.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/88589794297.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wodemiwudav.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/witebimajivenopibaw.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/19886669505.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/rumexulogaworubifogederu.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/navozanufif.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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 10140 bytes
SHA-256: 4f9c06301b604d819809bd6cd36c55741422f2ac25ba6077350bef6a9e5f0e2f
font_02_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 16000 bytes
SHA-256: f7a3535a0ba61aeef7a6b7e3401e17e82d151e3e616a8ffc2c3a13684bcce9e5

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