Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ab5235286b9201…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 01:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f27b439d1ab6802d8f75e2351c7ab3dc SHA-1: 04c9980e1380981d0956de35ab1b78086801a910 SHA-256: f9ab5235286b920166b163f3a9cac81ea87a7fa0645f3ed643886bcd733a6fa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggest a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this, indicating the PDF likely attempts to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=iblees+complete+novel+pdf+download PDF link annotation
    • http://lasfyy.com/uploadfile/file/20210701044348307.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/42354074946.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83e919830---92315679095.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a586536c8569af818e076585d7a20fde/7519269259.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/04ef3294b16d53905b2c002e5147af3a/faxuzalegituzi.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210820_232211.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6becac9e4---jukinefotepubiderumisudol.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p22tvais02dqim0ateta29rmgs/dujigosizudomizonizekiva.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021827165219425.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vigaxetizadotezurekilodi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/34716175173.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/dukotutujexamozuwaki.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/inudojowo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/90919351686.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4sak856skej2kp9ue9pmeif6u4/88026839890.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pagironotawubokojak.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4817e40d---5766655262.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/lisurexesugokip.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/13924292927.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210904205409.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/03f426dad09e8367771f8bf603f1692d/12840771011.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/97113951972.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/zodusarutozej.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb2b330e7---sobatevokiwotawotupabu.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_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 16428 bytes
SHA-256: ddbd516bae0510bbd7e22438276b0d1ac07e8ac7f4aef96afbd4fe4185504844
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 10832 bytes
SHA-256: 1cd909f37505944d9e7f9aa5358787b0a9f7c91c1965bcdda746ba2b1f21adc9
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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