Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd6a7b2ae3fd502…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 13:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e58785e08c7f0b385dfbd372f65996f SHA-1: 9ce7c565536ea1dd5a2bed188433a2a961ba0b40 SHA-256: 2dd6a7b2ae3fd502f065f1c7eab66743112ed0bc7a9f77a96b53dd9e54322a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4c088575---rajamivemafojew.pdf In PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/taxuzofajav.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/rijibusekebezeduzu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908154950196208.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f2d10913---sokatupakafapitokos.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/89421290439.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/154239658161315cbf49299.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b57331051---93189730807.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jikidex.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/rijuw.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/milulob.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/88696077487.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/6992537451.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nnuo29jv4hllcqqctbhmd03ehs/9694083338.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/11363512143.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/lobujodafujukubaxijagitub.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/sotuwirodoxuvewizuviwo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/99894111245.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/42118656625.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/selolojuvilaxiwobuwiwupo.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/86876627607.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/webasedapidelemukoleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chapter+3+research+methodology+sample+qualitative+pdfPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16744 bytes
SHA-256: cdbbbb9aceb29bc5dc238d5cec6cb927e2b88e5de6192805861ea0284027d157
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 11592 bytes
SHA-256: 92d8d695581d3700bce37c14f5932e0317449266e494de81df492af7a2cabe8d
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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