Malicious PDF — malware analysis report

Static analysis result for SHA-256 249147684ce8a187…

MALICIOUS

PDF

89.5 KB Created: 2021-07-17 09:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 893e860fd053d5002dfce73b026dd20b SHA-1: a2f127bf7994441b2c75d843c3aa40be490f4da7 SHA-256: 249147684ce8a187e464418d2062c5848a72dedecbaf0aa696aa71621241ac43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads and others on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dorrstrechy.cz/UserFiles/File/65283420685.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3e9a0a6f---83284418440.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/xudid.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/judeju.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d61915a5d---xuvovexefusibejaremel.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad98cb8309---lububez.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc08b05471---jelarovaxawiwajupipozurib.pdfIn PDF document text
    • https://raljob.com/userfiles/file/fobirenajotejezogakuduput.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bca8918f0---sizanipoputewerowili.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/5911720371.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982746b64ec---25242946213.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/db17dfcb7b37f93946922f99ad4e2051/54079047172.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/ziputisij.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/71532181758.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/13276361589.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897a5fec63d---88810521745.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/21324193215.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f76b942c---86920314825.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3dcf0f50---76581076298.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/eff62c1cc54036dc65a541a50bf8d80b/kibizekoxotixu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/33055990030.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/lijixidakujepu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7911b6855f64146369e9467c8639fa0/soxubuzavagerupi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bcfc8303---82697788549.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/178e9a06e46b2cc8d91a3758638ceb08/joziso.pdfIn PDF document text
    • http://artepcb.com/upload/files/fepotesakononusesapasi.pdfIn PDF document text
    • https://jetaime-shop.com/files/nejefebabubatelewovukevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=to+remind+ofPDF 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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10004 bytes
SHA-256: a3939d2f3bd188c1a1dcb4542984e8a59d8075947c91ed0672387f58e70cde5a
font_01_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 31376 bytes
SHA-256: 92f6b3b360676d01ee24ff58570f80a3a8494b0204053c35a1a25d9840ea12c4
font_02_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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