Malicious PDF — malware analysis report

Static analysis result for SHA-256 b350ae5502846931…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 21:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ced0265dfa16b7df182cc7501ae92838 SHA-1: d06aec35f9f864d0174a94750e1ad46c01fb01f4 SHA-256: b350ae55028469311bb92979f73ee46d0c61f24acdc58f1848addafa86af99cb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to copy and paste content into a shell. This strongly suggests an attempt to trick the user into executing commands, likely to download and run a secondary payload. The presence of multiple URLs pointing to compromised CMS upload directories further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mfcwestenkwartier.nl/beta/userfiles/file/65521989927.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737262abc0b---wimipepex.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/49491318316.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/59648126179.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b85221b13---rowobitovudimumusukapa.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c66746dd34ef316f657a0f6ab95ddf4a/10542946744.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_33013163344068AD.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e2e5550f---bizuzawowisipuse.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/45283290340.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/24197760203.pdfIn PDF document text
    • http://idroter.org/userfiles/files/lenipoxedekowamadowij.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dc170c4052a5d3db93bfc02a551576f3/15670922472.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/b8n8c2u23ifiq3j5huheqh4ur7/47097245931.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92aa6f1a8---bemeragun.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8dd16b18---rorenaxufaligatapul.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4c03705feb5b38ae4dc7aa10c2960d38/pasosugeb.pdfIn PDF document text
    • http://demkapi.com/resimler/files/32749719601.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/losixikamujoxile.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/nodixukubiw.pdfIn PDF document text
    • http://lblussana.it/images/file/43302250700.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/30m73oimo7ktsi1s47duat5093/bugupas.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9ea5669bf813a9ffefba7a32cfd462cf/fepafusaxetu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160852d5462eb9---devudigobulepif.pdfPDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/84g7u9ihprtnejttrk25jbnsm4/67992301925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jaws+of+defeatPDF 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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 19616 bytes
SHA-256: 46358ec32231de07eb4f01dcf503851bd6106d774eddfc93cd3bc4d18f7846dc
font_02_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 10080 bytes
SHA-256: 2a979220c628d95a579aa20e59b31446c488f5257e8d35d459eaa5edd53bfad9

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