Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad5bd7c143996bf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 18:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb78b925b872bfeeebacae8b4d0fbfc0 SHA-1: 05a6e4d32da13c2abae3f4ba3810d801dcc0fcfc SHA-256: 5ad5bd7c143996bfae587d0ef33c91ad1d43b7584396a9b0776022ce3053806a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kontiko.com/ktkweb3/images/upload/files/povoputu.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c74d22b75b00d2221d464e5f6f9fc66f/33702710685.pdfIn PDF document text
    • http://kleiberit.ru/files/file/6207811418.pdfIn PDF document text
    • http://vizcsap.hu/files/file/84376950975.pdfIn PDF document text
    • http://www.toptehnik.si/images/33510737248.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf764b01---52869458056.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/85323798305.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gulekijiwivajope.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/zasevatikaz.pdfIn PDF document text
    • https://telorgabus.com/contents/files/89288941477.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/surimamilojogirepitiriza.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/dolamoguzawasoneromi.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/89767994162.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/sakapadawuguwitif.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/xabejatopi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/11497a64633f36f4a445573f3fb45d50/fiwajawobi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074967276d42---50843530371.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/854222ed57b33627b7f5d02264cf12b4/46127994090.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117209884b8f---5955785911.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa67780ef9---bilomonejilezikobefukatu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/kesejokijedeguda.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e94457b9f---tabutalelijem.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/26893627700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=worksheet+for+class+2+maths+icsePDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17668 bytes
SHA-256: 86e658d5a3cabe64c1fe1131549db48681135827a5fa70881db5054e5ae7d9a9
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10700 bytes
SHA-256: 208380eaa5f91055b8f73a0a735903585df48c382a70874dc9b74537ca839749

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