Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a9c2aaf0e4ccbb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2fcb58e06e1de817879e1dbabcd527b SHA-1: bd9a8daf380e8a5883106a01437d9742636e3ab3 SHA-256: c1a9c2aaf0e4ccbba750c1cd78e3e6ec09d15b4d61db2d7289e7da3111c66a21
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, including a compromised WordPress upload, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://salonrewards.ca/images/file/60590435177.pdf In PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/11044824019.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/48864591352.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/83385714573.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/86993224378.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/kibowupezeb.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091519492029.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7dc39d6f5979085f5faa86a728c35523/pinuzolafijasu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614326675228d---nikekovadebipukukuxi.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/35149692270.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/15541959729.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaa42b56d---pezoviribapejekabijuwuviw.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/4626181494.pdfIn PDF document text
    • http://letdentalab.com/img/files/vomaridabim.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/90931743060.pdfIn PDF document text
    • https://onlinendttraining.net/files/wimifizafinelomelulebu.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lomemataki.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/netuxusupumi.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kufelitogalozenuxid.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9dd971c4---bimimogolijibesod.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/dijod.pdfIn PDF document text
    • http://gnox.vn/upload/files/zofokamimat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+like+games+for+android+offlinePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/tebarutiga.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vafopolivegokila.pdfIn PDF document text
    • 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_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 10828 bytes
SHA-256: ca595a8d98c99229965bc897380d929acc7ccb6dfbc4635edddb9412d77e549d
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 16752 bytes
SHA-256: d63523d90c76b49be5ba96b92e792e8c09cdf4144d65aa41543bb3e89a8d1435

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