Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9afdf2d59172ecd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 10:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed88468e1030b528c859b3e1044dc3a4 SHA-1: bc4819065e4fc75742e793396febff0d56b8553b SHA-256: a9afdf2d59172ecdd111643d1591903b0472906b583a9f967cc80a327331f115
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple external PDF files hosted on various domains, suggesting a redirection or phishing campaign. The ML classifier strongly indicates maliciousness, supporting the assessment of a coordinated attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://cateringkieuan.com/uploads/userfiles/file/sovanatasibazotoxarafe.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/kejevugugop.pdfIn PDF document text
    • http://djpress.pl/Image/files/tivuzewenukix.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21290346299.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/60842070677.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/bosularaselodabux.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15843191864.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kolaxexi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/38587239942.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3c439d92dafe459adac28555f0df5d5b/71458350205.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2c728b44---pojinebuf.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/85691006862.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/13169962392.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/sapasetiju.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/91273652675.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea4fcf0f2---tesubuxedipizedaxif.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/koxumomudutivaxeko.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/3856065239.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/vosovep.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/22541848910.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/befiluparujunudovu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/28116562613.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/jolezurezosewovod.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/9547463918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=granny+mature+oldPDF 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 17600 bytes
SHA-256: 6b91c529f128adbade62d5ea3178e40599d9d45e51b3c84debc0debe9020d3e3
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 10404 bytes
SHA-256: 93f063cbe7d8e9136417970f769f5b7a5579ba1cd938b6ea1982b475b1dbb12a
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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