Malicious PDF — malware analysis report

Static analysis result for SHA-256 275696369acb06f1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 15:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 419688296c262f4a9409060fb1bd6683 SHA-1: 379f89eea3225c34b98738706c8e2547eb07d2fe SHA-256: 275696369acb06f117f4fad0601324a4c4796d4e6f68f8faa8f4e2267bcfb8b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware delivery attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious code. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://catamma.ru/uplcv?utm_term=bioaccumulation+and+biomagnification+worksheet+answer+key PDF link annotation
    • http://www.ciesol.com/ckfinder/userfiles/files/duditonikixez.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc80e56669---wilowotukes.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/jokosefagesuxa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110428e6f920---zikuwosinikulaxeper.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/kopanubelenuxisoke.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/88488483973.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/71790773184.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/4cdjikhnl92ieivl4qnslvqrc7/6442676357.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ia3fu4jq0oih4uf0456ki95odm/50552543187.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ee5dd777---rituz.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/31f938da2259217b6d6f813b28836fd1/feziwopuf.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/53560345655.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/16985363118.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/kisazojolitasurixuwo.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/pagabibusax.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pgjkls8cdltklaqf6rbnohbdkl/36714313138.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/86983255279.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609025a5992bd---wizufebusuvikijotid.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2f178acb---19118682012.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/82757265642.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/48022147522.pdfIn PDF document text
    • http://firegallery.ru/img/upload/voruxeva.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_off0000c60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 11508 bytes
SHA-256: 90280838cb77e16cee9c92a92c4322e4d82946679cbf709d86784cd240e76930
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 16716 bytes
SHA-256: ee7a5a09424fe5f433549ca7e57c4a12a5c6e809bd7b4e62189d19999d93c83e
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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