Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f198b7fc00023…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 09:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 175473cf532482489c9d38fb95218e44 SHA-1: a0ed4a43652b1f9afb2314fb5486327d4e125390 SHA-256: 553f198b7fc00023f85b2c7980c090ec36f113d0e146b4e7731858351255a55f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or plugins. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly suggest a malicious intent related to user execution and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://montagnobozzone.it/userfiles/files/foges.pdf In PDF document text
    • http://glttek.com/userfiles/file/78186397152.pdfIn PDF document text
    • http://pinxedien.net/upload/files/kukisutevavakojanodigisij.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/81225298925.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/vopasodobodakovefir.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef1d12bec3---10482893515.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429fb2c564c---regunasoxir.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/67834074767.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vadafuwavuvasus.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/teforopolurorenij.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zivotenedukopuwuberunal.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xijuzuvobug.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/veguxexomuxukulipisejaw.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/97752533581.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zutemenaz.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/lubirurajidapaxa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d2d0d3e58802ae350d097a4eecd54aac/kopaxuboripasotalazosigam.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/3523769221.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/54754969030.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///50734424613.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/91612430773.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=which+is+best+ios+or+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xazajugerarafazuregekivo.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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 17052 bytes
SHA-256: 5cab0900d01218095adfb8d21a75e671b4859891b15d0f1994c808662a166e3d
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 10552 bytes
SHA-256: 4891e7322c159a61f9e9165239b88ac6322795558026a995ea0d505b94bb983d

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