Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe57e37bfe8195c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 11:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 973b26e3c77113231637e28664a908d1 SHA-1: 74caafe8ba05f9a9ed8bcb76ec6e365bbf01caff SHA-256: 2fe57e37bfe8195c5bbfb294d5c5cf752553690282b0e74e4bc3ad756d37ec97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://activsport.ro/userfiles/file/8390884847.pdf In PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wobatopibozikafujeperadik.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210908184946.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/82922343480.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/xaxijavejujavelojemilexu.pdfIn PDF document text
    • http://splogservice.ru/content/file/mured.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/ralejaj.pdfIn PDF document text
    • http://rapet.hu/files/51852560606.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/52914541653.pdfIn PDF document text
    • https://duel.pl/userfiles/file/54481060883.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a62b9cd---74218571976.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wifesuwalazisewiwite.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/fazazulapi.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/xodukaxafobojusawuvip.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/wigona.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613058fbe3019---zepub.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bojafomodokopirosenabegof.pdfIn PDF document text
    • http://nensi.si/upload/file/61427344536.pdfIn PDF document text
    • https://deepex.hu/hirek/files/46981596901.pdfIn PDF document text
    • http://vecsecity.info/editor_up/lotizi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/14672476475.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b78c5d423---14002367353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+rules+of+survival+cheatPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/nojiduwatopasi.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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 10824 bytes
SHA-256: 02c41d12c28045f0c17ce621cbaeb6e712b7349d7ea5b96c5d148681a8f16796
font_02_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 17272 bytes
SHA-256: 247cfb5f1a3fe02d188609818477b900b458b0c4d750f2a468fc0a4b8ce2d24e

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