Malicious PDF — malware analysis report

Static analysis result for SHA-256 15516bb17b8ea445…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 05:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 884066ab217c5a3923f4281473965e94 SHA-1: e1cf7af6f5a51e9b835cba7dc843b6c371306aca SHA-256: 15516bb17b8ea445b05205e9da6f08835ada74311531513102b622f9f48bb894
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://phuquytravel.com/nguyenvanlinh/files/9944269141.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eea760f1---54103943283.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6288979220.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/93668892641.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062405490761.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/74377877786.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/16982144353.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/62916206438.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rawawevimuzajipizenogazo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9ad2ef2c---75987080102.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/58211541218.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5851042c---miwerenawatemujitukiso.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/xolitenakawino.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/16022760704.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/37741656524.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/28029457897.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/37719082570.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021082619443870554.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd7b649ec---gibumewevunibizutaxepakid.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6293ae77---86053208900.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/43532232125.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/65517397970.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/90g7e7cdk4mf9qr91mjqgdua0v/kiravorapilumimusel.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/69219021165.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d858f392e0baaa0fb662cb4523945fda/99800888030.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nfcfu60d1nqp8rc5bgt6r4hsno/wufiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=magnesium+bromide+and+chlorinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 18928 bytes
SHA-256: a3b6e155fc986130a0699b548fa74ed28c139d9ae2887dd44c1998081876e1f9
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 10952 bytes
SHA-256: bd7afd4252c8770b92fd0c9d794ef6062614aca4a8d75dda9e0f84f37bcfeec4
font_02_sfnt_off00012b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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