Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e8ef8e28ab9aba…

MALICIOUS

PDF

91.1 KB Created: 2021-07-05 21:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c1340b4e9ea8d4d1dd8adb973404a57 SHA-1: 460450af7e769ae9417d7f00784643b8ed695f99 SHA-256: b4e8ef8e28ab9abaf97ac1a40a1df43ec0b640abf75ee656ecad828b1fe9dafc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites and a deceptive 'download button' lure, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=real+life+korean+conversations+for+beginners+pdf PDF link annotation
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/miqasnb1mn0smkc00399a45es4/zavizuvirusaduso.pdfIn PDF document text
    • http://aimic.com/userfiles/file/34283024047.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/85230500551.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081407858f0e---16832327090.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10dbb90bad---1983760156.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93126ca59---83631469032.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/19197306540.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/58681209418.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b02066a871d---wediwusoxagijal.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee187e055---31892981205.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fdtkubrsnc61b132blvsqm163n/7498554870.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nilerirodararefadesazaveb.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/wifosafijitozumajas.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e79e309f---79772507360.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/zukipuwuwoxerazotufupex.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607761b02d029---45987844555.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/41490087706.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54455bcbeb---novidipuzul.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4597164fe---visudeva.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0035214398---51547294732.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8374966a9871eb6cf4a4520b9e415210/lituf.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sikawata.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/13104918121.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 2600 bytes
SHA-256: 45542d8894bc81e21eebea841e115285444392e2e969edd37442fec70914f790
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 19904 bytes
SHA-256: ad51022bf2054db9050032793f0da3aa1c934e600776331f4e521db6cd5cf004
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 11140 bytes
SHA-256: 3b08831f2a71640787011b350414cbcb7f2be05b9acd42ab1c6ee30d03172c8b
font_03_sfnt_off00014468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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