Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfe16bfe6db7adf…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 18:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a744b198e9eaa5c9b68f312fa8f8a028 SHA-1: fccfed9046e2430dec83e07a247ad2b532b90564 SHA-256: fdfe16bfe6db7adf9b705fb92fe7a1b7e98e1345d048bb6de6b07b90a5fb2a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=murat+ezhel+aya+mp3+indir PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c9657f6f---30199377588.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/salabukisuduximamipakun.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/surojizititi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1f075772afb0f2aad3857b512bfed4a6/6163374537.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5020062a1f---68100265428.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/kuruxovisimuporapik.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/27891493009.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/271ab82d23a358a77e5f11b16c55c23e/lutanomowotuxegobevad.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/vupijofe.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/wabisiwovuvasuxobapesoma.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/53820690902.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/nonizifori.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zowubikunizudejasavofen.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/dunanifepuvuzonipux.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/xajetut.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kijavomej.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9728237815---47676955727.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da77d9e388---rugivu.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/gejirumedidopesogevakab.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/digavab.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/9369879247.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/8376802423.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000134d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134D3 19300 bytes
SHA-256: f36a41ee27d77f63a4d6e84e7b3703dc42389f9f2f762138fe9cb2bf52b5964d
font_00_sfnt_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 18548 bytes
SHA-256: 7139ea58b1ae46d34c2427f984fcd621d39688f2a1ae21c206950012592cd75c
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 1772 bytes
SHA-256: 172309685fe98285604e713d49568994867313c34855d65ac26f2a3d6e9690f4
font_03_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10808 bytes
SHA-256: b1838d193c3f6056f250f94ec5f9b2c25d7ec173534dd0b9ef478acd49534aaa

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