Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abde00286b44540…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 03:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c37afa84726a04cc0827472226273df SHA-1: 6cb81480469ef782f65741c6c497e5ad91e658ba SHA-256: 5abde00286b44540797c443d8b8233f374c0fe698b47e8bd10e5b4e9e345231b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.98 further support its malicious nature. The file's structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=telecharger+adobe+acrobat+pour+android PDF link annotation
    • https://hearing-outlet.com/uploads/files/202109191810202328.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/77933070323.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/vunevar.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/zuwan.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9d50f9c4f0365b84a6085644811b8851/89345617269.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/ponokubomowuvireloza.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-17-01-22-48-67.pdfIn PDF document text
    • http://cataga.de/beta/files/file/95223832690.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/fawegisajerikuxazekexi.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/zesasu.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/xulilawevi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45301634771.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f27971eec445bd38d90106c1cfab930f/68185394645.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/98981808284.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tukegubamufe.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/gitoja.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/63591127378.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b31ded36---75825502154.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/vetenezow.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/84587775167.pdfIn PDF document text
    • https://conrays.ru/f/data/pubidumutuvuvovo.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mugufusozaga.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/vesesujofakeratirunifag.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/59065657491.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56501244815.pdfIn PDF document text
    • http://manu-transport.com/documents/file/lonofebenekit.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_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 10828 bytes
SHA-256: 14a7f1af5c5b346ca7546c59c324d0b22b3e539020b9296afa079a3312d5261e
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 17788 bytes
SHA-256: 509699b9ccfcd6d2224ffe949543ec249eb380fd1e263f32fd153e93c78d1267

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