Malicious PDF — malware analysis report

Static analysis result for SHA-256 e163b03ec9a87927…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b21c1d8ef0be07b59d2e3ff39579625 SHA-1: 175b4eb97f284a8d5eb2ff07f9480f69ea9898ab SHA-256: e163b03ec9a87927d7c9eeb3d1b0d42f1d943faa532525496755fa40ef380ff3
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites, likely serving as a lure for a password-protected archive. This suggests the PDF's primary purpose is to facilitate the download and decryption of a secondary payload, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d93d5f9594f---xovap.pdf In PDF document text
    • https://073741256.com/uploads/files/202108301325177203.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9f5f265437ef536299f47212cfe11753/66321954819.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/figewobesidufixipo.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/gesuvipeberuruvulowudaguw.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/vululuf.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/bamumus.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/89786922791.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/gomofu.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/96836502355.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vanelofovokuwedidajej.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lopadopakigifitebulosigo.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/61217995144.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c392d2827b---752273334.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bazexexidimaxomajik.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec783f212---zuliweribizi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/defalilevomelolemuzow.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4290873e4---jafarotaxade.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/8695725371.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/80b4038b8ea2224318d8a83a63377171/bewuwofusakekepirigus.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/82038030ae1999847f40cfe0865c5fe0/38232951446.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4feee9c620---37027653793.pdfIn PDF document text
    • http://robbes.nl/media/files/54367018637.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lewopex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cpwd+plinth+area+rates+2001+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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10884 bytes
SHA-256: fcf2f98e451e2f7eff47c04dd47bd46cda82576d35eacd5f361e9cc650f2ff19
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 18560 bytes
SHA-256: b15847c3e36e6828f480221e8b490bfe8aae0d82db12ceb9731db69e615072b6

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