Malicious PDF — malware analysis report

Static analysis result for SHA-256 d120c07b8590c65c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-15 18:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f6b6168e642165cca01872f8cad18ae SHA-1: fbd47b3ca8b53780da14032b009441351ab10ee6 SHA-256: d120c07b8590c65c9acf7ac92a744e5070c13bd8f2aa4191cb42b6f0d738e89b
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm hosted on compromised CMS uploads and attempts to lure the user into executing commands via the clipboard. The primary attack vector appears to be social engineering, prompting the user to interact with the command line.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jvid08rm83d9afq63j9m8u8u8a/1081439448.pdf In PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/tugonefufiniboxebasiwon.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zadugopotamigorofav.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/34986706750.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/39983451917.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/mosuzemutovupiwegafikuzog.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/80106341222.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dodazemonefamekoruwirega.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/wapasovibadoruw.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904052026354.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/kopaxifu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/14821638817.pdfIn PDF document text
    • http://live-net.it/file/96590929176.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/78785466020.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/71857048237.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/xuwut.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906153248.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9vjnu5ie8o7eb3emsij41qmh4/85857617385.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/65425443595.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/68695188790.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e45679dbc---98670010517.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/45713859307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bootloader+unlocks+apk+cyanogenmodPDF 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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 11124 bytes
SHA-256: 6d66c4546951e5b00777e4f49a904ad11b18c0720a6edc6d82fdfac5585c2084
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 18160 bytes
SHA-256: 9e43fea670e268d24228dd5b01af31497c60f2805424c563568ad1bbcd4fbab4
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1