Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcca90165bf2107b…

MALICIOUS

PDF

114.5 KB Created: 2021-07-03 20:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: be3686731b9af9a08ef68095264bf0af SHA-1: 655456ce817eafb7fb8610185e0d2a92b0ed6654 SHA-256: dcca90165bf2107badede717af82fe263895ae5488c11bc43dfeedae635dcb72
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c165913d6---ximikadonepe.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3e1b4dc4c3d7476b1c168674eba29d67/pejixawov.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c9fe4f51---74661089074.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc42bee0e5---14493513475.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa13c8dfbc---lizonotixepozetexokotip.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/85534887402.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jijuvefipogimanalijodoj.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/joweroxawur.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160851bb42e0ad---97708736837.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c82475632---tijokutalujoxerajonezeli.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7gpnm63a091dmii8jgukrr18tv/51996488892.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pirereresu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7d1ef3468b52c0b5e67644641ce7f860/pakugepuwidupiginedire.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ifl5v7q57jpo0104a6u5kvb7l4/vivopabofanumefowewuseb.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce91d58d08---vixalapimitilorerobisofuw.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/28601788189.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40229559a---92419839473.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ea3b9010---37456454763.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/af1gmle95dmk8n4hifouss0rs4/74014968607.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f0953537f8766c98e97c67065ce389d9/wugomatu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9664451eb6---riwuzero.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0b549524439ea68c96e813e04626254e/54498696052.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099018fc1cff---14814763912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=competency+based+interview+answers+teamworkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 17764 bytes
SHA-256: cd56bd5c5671adec0604e6bec36ba1ecbbd597394c0f127af0cf5ee62940023b
font_01_sfnt_off00017495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17495 11160 bytes
SHA-256: b888f723e1e4e85b8e3b82d284bafdac6281c16272c1b3a169c65919b87b32a3
font_02_sfnt_off00018e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A69A 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee

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