Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bedc3b00a8553d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 05:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23d9fe0d6f5942147a5b1573ffb1c305 SHA-1: 41b64c7894cc3be6eeecbd6086613fec42c28aa7 SHA-256: 70bedc3b00a8553d388f0f229735d9ddec9e29d84d6958cde93f6eea02849587
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to various PDF files hosted on potentially compromised websites and disposable hosting. Crucially, the document contains a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing downloaded payloads. No scripts were extracted, but the overall pattern suggests a phishing lure designed to trick the user into executing malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fruitvita.com/files/files/74771621192.pdf In PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/544986121.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/65033349297.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446b359de16---dezesim.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/71212100819.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/20355067868.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/47273864138.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/riwitetelipogumimufo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2e7672b2---fowuzelipimotegozosit.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ff3c2e988---nefavemugorupumazoroge.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/85121574405.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/13385441208.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2f8c76a2---77473083264.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614654a93db6a---luxuz.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/24704229181.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/595600320.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/27134136481.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/gebewejojavobaz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/adffb6ae15d1edfd6a7b1b509379ebbb/kivurodovibadunigoro.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/giwalaburok.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/jusolivo.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/topajimadamitexasiki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d591b495b1---3437503077.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/midubepetugatirulidugimi.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48386323093.pdfPDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/91152650315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+studio+screen+record+mp4PDF 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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 17160 bytes
SHA-256: f794cbfa1a52299aaeacd9085ac3377f6780cae963d08aad2e77e6bee99aba32
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 10628 bytes
SHA-256: 72085097d11e6d76c99f9ce1da4a6f08ec8c06e5d72bb5a92c76f8becd122b29

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