Malicious PDF — malware analysis report

Static analysis result for SHA-256 05819c7fbbf8c256…

MALICIOUS

PDF

107.0 KB Created: 2021-07-29 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c94bec2a38de48a106436a662eb4a8cb SHA-1: 1847872b2468a1c1a5f45a7e0b4278ef4c5bc4b9 SHA-256: 05819c7fbbf8c25605812078e05b1438a8347578aac97832b8aca3861a21995e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links indicates the PDF's primary function is to redirect users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/88625893649.pdf In PDF document text
    • https://eubeer.vn/uploads/files/jojekuxarew.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jovifevoxivoziluwusorugu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36dfcd205---50026104615.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210619192441.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec5a7a88b4---dodakedinin.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/68574465657.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jilukogenajukijifeva.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8694020660.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5e873bd1d5058a73dfd53a5ee94bdcdb/zukomizuguvero.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f0279e57---sebokedakim.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/zizifelivigifakamo.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/16141125936.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/gosogojixutojugigovetim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7e237380---wudizesekawunavubem.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jhb204veph547qe7u2kbqob5c1/42393431528.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/001ca56e11d097761030453b866cb645/19708864609.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6eb9e9e3e---kezimowovad.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b85366b6121c9e86eb7b9e392e75dd7d/19680446231.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/papatovorajebut.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/13729911647.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a94d0f487---16919422042.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ad28fb08---jikobojuwujodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+some+areas+of+housekeepingPDF 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_off00013fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 10944 bytes
SHA-256: 7840a838a8f352bfd30c038dc8961af41c17a19ee57dd539d3d394553cf8123f
font_01_sfnt_off00015933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17145 17420 bytes
SHA-256: 21ffd27240b162a643553bcea81d4edf761943ddb4bcd61aae09ac8dfbcb0dbb

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