Malicious PDF — malware analysis report

Static analysis result for SHA-256 e951ead97c436c9c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 21:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24fd9298236a2364a5549dada219364d SHA-1: 5bebf109c3de4f2d75f356ec114f949a3c288005 SHA-256: e951ead97c436c9c507359f7862e2e5b80939f0e58024dd384e7f4b24c1df017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware or phish users. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b245f5ddbe---86080588302.pdf In PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/moruvarijidolunolosidu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/70677372696.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/2170697787.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/nawidoxibaxew.pdfIn PDF document text
    • http://dztechfin.com/upload/file///84320138730.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/bidixuxe.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/19771562423.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/teden.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210914154830.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kadegimolelilaw.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/34019924724.pdfIn PDF document text
    • http://aa-nusd.jp/kupesiviguvetapulusejij.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/bakifaz.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd1ecdf9c2d592ce3d33c289157da5d0/19549483370.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/55021746839.pdfIn PDF document text
    • https://phuquiland.com/upload/files/tafenokoxegejavu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef460269c---sadowoburesuziwuvonus.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/31582222192.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/72427610984.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090722551460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bollywood+magazine+pdf+free+downloadPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10888 bytes
SHA-256: 384d56fe1b1812fc4416890928f05b3d8e7577f172c5a221dae0229225be8d92
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 19608 bytes
SHA-256: 6fe13df0ccb8a2bd708aa6adbbed53e506ec45aba4cc9c7719397eeb638e351c

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