Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd99d2b6e87917…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 09:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3857b85fde0bdeb8630fa1827b207f5b SHA-1: 21f5f013d9e46b697be810888982da706826cc24 SHA-256: 98bd99d2b6e8791760c4de0b380c621661aa3967645621760cd62a4adba03143
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlight the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://glassick.com/userfiles/file/816688404.pdf In PDF document text
    • https://termofriz.rs/files/witimazadamugikonetas.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/54123079650.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pimebepa.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/99337593092.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9d9f628a67a3f535174587a1940288cb/89660162975.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/xosiguziwopak.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/18438962453.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ve5cl07tohvng4vskso83tk786/93699024340.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/kuzivusarifetumife.pdfIn PDF document text
    • http://askort.pl/Upload/file/74759222034.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/74524618429.pdfIn PDF document text
    • https://mavibusiness.it/file/71065173818.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/65421327327.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/52895749895.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/84620304910.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/jozobojibedavuna.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tunekerajorifewejinup.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/11992038983.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/riridakego.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/89458426935.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/86034487925.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/97714343701.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/91920082114.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5dojmq81d2h6ifiiha4212d3e8/witukoxukupotarafudamon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+transfer+files+from+apple+to+androidPDF 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_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10736 bytes
SHA-256: 89295e2abff6eabcff74f0c373349e2e1804ff99d5d8bd377d0c0a4a683f7cc0
font_02_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 17540 bytes
SHA-256: bc277521371e4b470e9417aba5812bdee32b200224b46089787c208ca62f239e

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