Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b7f0fd32e77f0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 03:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc5528405effd2c3a1e80fbd3ae0a2d9 SHA-1: 86e549bb8e4364b3f4ea3820d6bb28ea5b792b62 SHA-256: 274b7f0fd32e77f0c0edf75c38ff365b42777f55f1ee1cf862c78cb109bfe3ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

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://khotelmarket.com/FileData/ckfinder/files/20210603_2695EB5E408D29F8.pdf In PDF document text
    • http://liccuza.ro/stiri_files/file/mujimojumudovufo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160fad223c730c---30836617865.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94495db2bcfa4a9e3fc5fdc93f02996a/41003680229.pdfIn PDF document text
    • https://egca.fr/userfiles/file/mivosukonidi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/xexapaje.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16119dd8933d4b---63338309832.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/10aa60a333263be8151d85cbcaa1ce00/76873615981.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/zosijuzidunapufom.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/timusuxolowavoruw.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4dd9c8b44---kotosuwadabakadeke.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/57ter8obpq4pvlvi1giep22pmd/lubuzuvazavifixerimawes.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831f0381e5a---33508033087.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/62964588361.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/32620536759.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc88bd7a430---12554277781.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0913a450b---4350097298.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cccb8ed9ca6e5a75ebbd520306b6c21b/16953562637.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/pumerefaforowojazunefi.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f8217166---gowarakigubenetixofoku.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/dizajobajo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/k59scs30kiib8ff23cnhbptg08/11476700768.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094035662711---nebefirubobaxodunere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=austerity+measures+the+new+greek+poetry+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6739471f602cca8b11eaa82d126b9abf/88388768619.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 18976 bytes
SHA-256: 47a92f1f81d714c3ef7b3217cbeac2370f46608b1fc7f8efd1733ce63e965bee
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 11272 bytes
SHA-256: 1cc878c6b01fc35a2215b464143737b71db917ccc60f13daf7fbeaf22394786b

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