Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fabaea1bdd4c9dd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 00:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29b808f7fff9e69ae1d01af503b1c25a SHA-1: 3d04d137de53b96a16bb204657f30942a50d585a SHA-256: 8fabaea1bdd4c9dd25d5b686a2a128ffd05c13fa5b56bc53fa4203f3d0b45e89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains a lure that instructs the user to copy and paste content into a shell, indicating an attempt to trick the user into executing commands. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent to download and execute a secondary payload. The numerous embedded URLs point to a link farm strategy, likely for obfuscation or to host the next stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vozilasavozacem.rs/files/6355589118.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/dedakugavudebevozekuzogux.pdfIn PDF document text
    • http://erex.hu/upload/file/12082442869.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/24450583737.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/52103910885.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/678179c88e34ef88567510a5eece514e/33476789571.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e616fb43540af2917eebaf69d4eeeae/divivoxijebula.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/82283430548.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/46513702402.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sedalitagimenofidopujogi.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/32514382426.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/12181231013.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/loxujap.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/9924081671.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/rotapakipiwafipa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6de722c20---11636556591.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/winilufisufapunemep.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631161354.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95391673500.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4245289d---vitiwefidojitozovefa.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/44835286234.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d6d60e0e---64813123156.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/lofuxudijesana.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gepod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f18c07e5---21281929043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=raspberry+pi+4+model+b+android+tvPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 17996 bytes
SHA-256: ccf75f0443d0471ee05cf0d172c119a0b7832bc35cb22e362f755fbc2570e235
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 10996 bytes
SHA-256: 431ea2a23274fa831303c28716d413bc15d1a8cb94f6497f69a1111e32603d9c