Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b58dd69f3596d1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 04:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77bdae840f10e6ff2212e6ed103761df SHA-1: 35aef708e382d35f8f1d66b62ad3bde5dd0343e3 SHA-256: f5b58dd69f3596d125cfcc968dfc20bb990feb471f62a61a5ad78088cd6ecdd2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are identified as disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic to manipulate search engine results and potentially host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gimhaejazz.com/fckeditor/userfiles/image/mujadisafo.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/85692207721.pdfIn PDF document text
    • http://annabarons.lv/files/files/11085896897.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wibiboxowenoda.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/jazufotop.pdfIn PDF document text
    • http://tochuchoinghi.org/files/98693896446.pdfIn PDF document text
    • http://metall-press.ru/files/xaximijif.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/toxevetodipubowokafuraf.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613631b4e0c40---90758032510.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905160727.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b53b19b3---sugajiganitofipuguninewo.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/mumeruxiludetudekumidepug.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/nukasut.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/tukigubofoguvazusab.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e491cb7d9---bisubogaz.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/63010866281.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/42725467280.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/burol.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/99552226818.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/99367737035.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/95960238668.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109030345421893.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/gekagimepuritir.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_230006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=st+francis+xavier+parishPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 10656 bytes
SHA-256: 4e0ef697695ced5a2c71e66ea3bb247d4df4274adb80dbf0cf1d1d9b21e35b2c
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 19812 bytes
SHA-256: 6c7b7e28b8323f54492540a8a0df6e89c54629f5fbdb522e1e563ef1210acd7d
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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