Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47ebf67e48531bc…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 13:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd721ecc0844c13975c4337b6d53885 SHA-1: c43a235abba0e6d3291f2241efddf10e651ed43a SHA-256: f47ebf67e48531bc8cfd23711b9d562355922225f5374ba891530baf14cafae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various compromised websites, likely intended to trick users into downloading malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=wwe+2k17+game+download+for+android
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3285c9165b---14081261584.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/08e891a5cc1b8a7d01f6d845489ee643/87740414060.pdf
    • http://sewakendragroup.com/userfiles/file/92941782176.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/fumawevekezaratil.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d3d5ff093cb9ba4c93761008b7375b4a/95236852619.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/16eba2a8bd21161a8ce86197f5116e11/79616110328.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8daa5a1024---7372069706.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2092584bf1---konivuk.pdf
    • http://ca1970.com/clients/10044/File/nixupelupatiwulogoja.pdf
    • https://schmitz.cz/res/file/taxoxabororigevuragupuzu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f601b9829---32850216582.pdf
    • http://itkaufmann.com/images/fckimages/file/93509186449.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/67871970049.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b897d694d---wuxok.pdf
    • http://architects-desk.com/uploadsfile/bodajolizurot.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b35594237e7---35691976297.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5cb5589c66045cbcd4b52720edfdcefd/betevil.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504041352525931.pdf
    • https://aslimitada.com/userfiles/file/65968165609.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/g17cqun1jujpo4q6omph78pmb1/3506292246.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ti7nc9c267tfkm4cfcp6dtb5bf/xugejizosavesi.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087560fd1ca4---2471931060.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe840aa09f---nexigav.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fimamufoxosokepepuwib.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608061ac142aa---semafonijirimosodalovesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
font_01_sfnt_off0001153a.bin
618819e8dd83919f7eac8762aff9efeb071a1031a6949049d279bc2a0363b419
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 16768 bytes
font_02_sfnt_off0001410b.bin
9011508887182e0f00b68013b1ff56de4ceabedfd56923660db6e00ea60f3ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 10824 bytes