Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59a7a33766b2c55…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 08:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c88788a3b8cb055b8f9d85c7c3292439 SHA-1: 6ed6b0e8a562c946880368a4aec3395c8fe320d7 SHA-256: f59a7a33766b2c55955828748832cd6fd926ae0f35273ee0fc0f107e8a60aa77
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiocastigli.eu/userfiles/files/7899073454.pdf In PDF document text
    • http://www.amedna.com/userfiles/files/53566230723.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/mivaxarawawa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ece46c6b2---12469264453.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/58188961481.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3964734825.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134530eb8707---12581894945.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/63882166162.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329308b6f4c---bebarimosozex.pdfIn PDF document text
    • http://grossbuch.com/upload/file/pewanudetiraxaniminev.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161379dadc00c6---polifutefujomamurimemo.pdfIn PDF document text
    • http://aurora-c.jp/files/files/lovivob.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18683103892.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbe51b137---16547234345.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/34812641423.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/powuzutopopovupopariju.pdfIn PDF document text
    • https://krossi.ru/images/content/files/kotirizebati.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zinogedinogomuwobixalijis.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/49841318158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946ab63361---fimodiniliwupok.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/50803083904.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_9CED7A9D45DEE3B5.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vujuvewosudarinok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdanet+driver+for+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vivigu.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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10200 bytes
SHA-256: 09791ac0dfe890834b4723fd56e8319285602b4009b23e50a46c26e12dc91a6f
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 18016 bytes
SHA-256: de0e8f23bc2c8c1391db4caebccf8adb77766fcdd7153ff4ede2694ef534ca99

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