Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f460651dd3cf466…

MALICIOUS

PDF

86.3 KB Created: 2021-08-01 21:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7fb90c1525cf45693aef691ae39f2fb SHA-1: 3a13f797c29d116748c7b03d598091c3d620e836 SHA-256: 3f460651dd3cf4666512e5164502a8f511bff236de4f084c904c1201cf853937
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to copy and paste commands into a shell. This is a common method to bypass macro restrictions and execute a secondary payload, likely a downloader, from one of the numerous embedded URLs. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://sendedianqi.com/upload_fck/file/2021-6-25/20210625212700630452.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c22577be655---5966441994.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/gamabagejubetixupis.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3991558111---lebowuzerajomuladuvew.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe6788d15---33086970548.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/49757829233.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2930eb7ddb---wekomamorokuduzawi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0158bf2c16---366387480.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vesuworozaxixixixali.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766bee0a1ba---fajegitoniwezajixefabari.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/53sm3ecg1in7mncofthnnlcpub/tatunutelodo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/828fac8e4b54defe3fdcc5be29d7745e/bawukukowipawekuzi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c154854fd4e---6531269280.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/6o7cinf5iinajpq05ssqotiqn5/pubevudumisanigadeneku.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/76772057368.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/laxitivabumuvewomo.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210629171453.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210701_A36745C59F4929F1.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/04aea66fd688b6b67d3cb7205b8cf155.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/77d53b323eef1cb99d9b445063b1b6a4/61389038507.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wosefudidopitupizu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6bf07d2d---nexuxesesizetevi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/92139526749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=guide+dream+league+soccer+2017+hack+ios+downloadPDF link annotation
    • 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 11380 bytes
SHA-256: f6aa22a553c21d2d59c46f8339efcf4fa5568456e83314c0e96b4fbb6f34ebb9
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16916 bytes
SHA-256: 35ee3ac7b709a3f3093635e62c1cf59f2b91a1695014d5356292a6bf87e6e26e
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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