Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3cec59361cf7e5…

MALICIOUS

PDF

73.3 KB Created: 2021-10-06 05:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa585ef75ab512b8df062669f5fd44a7 SHA-1: c1643b8a4260886ea80c8a0628b7edd0f5354cb7 SHA-256: da3cec59361cf7e559867e42283cf58ae7a18caa979a00fc93f7a3647b59d472
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the sample is part of a link farm pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rapn.ru/ckfinder/userfiles/files/fatojukawesifife.pdf In PDF document text
    • http://dorrstrechy.cz/UserFiles/File/26601686665.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144c38cc1e80---48180808930.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/bifadimajuboparusijanuwel.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/60970674602.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/resinomona.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/1918561446.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zonejugulelajefewikum.pdfIn PDF document text
    • https://davaocarrental.com/images/file/97310064780.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/53367742128.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/vomujulefesa.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/daxinetekoresilubijike.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b141bbb96---43812279181.pdfIn PDF document text
    • http://podarox.ru/public/files/zesapalisepipikarev.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/pexugogexemakizudomelad.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/75762788736.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kibuti.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/pubigofigawe.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/73755473394.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2d0e635a---44525422489.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/wagazazemow.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/56982937351.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/zokowapeb.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/61328655424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=iron+deficiency+without+anaemiaPDF 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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 17512 bytes
SHA-256: 971d0802adcfc1d7eef872c97eb3720afa26d2b23c0951d8e7775e37fc8e77fe
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 10780 bytes
SHA-256: 10e31849ef63e0f30b524e02c9c96b7ad29304901c244836defa117ce9cd9057
font_02_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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