Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5c72a73a8d3201…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0abc8144c19010fd4f2187cb070cc595 SHA-1: 56da0f17008ab3802836d37c37ffa78d888cc648 SHA-256: 8d5c72a73a8d320134b46e5615f944d6a29b71ec7a32eafabbd5c956cf431d87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://doubler-son-capital.com/photos/files/bodesawopa.pdf In PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/gefojusejosonobinub.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/25700952073.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/18694576081.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138605d8c613---30722650016.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/widet.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xikuwi.pdfIn PDF document text
    • https://fivetc.net/uploads/files/70982465653.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mopomufarugowafozuwutuwiw.pdfIn PDF document text
    • https://funke.be/data/file/79264662228.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137318477d2e---51821227974.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31640614469.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/79933990874.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/39705890043.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613059c1c20b5---nanituvigewusone.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/33271690902.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/10826212757.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/gimidigibude.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/28786496258.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/mibulisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bewafa+sanam+webmusicPDF 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://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_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 18676 bytes
SHA-256: 3a368eae9ca4180f30688daa549b37200574e2ee5ed81c9dcc53127a5f1093ec
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10512 bytes
SHA-256: 6471e5df8c4137db18103b86421c6ebbbe777a87c961d32141f231d958d3b189
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1