Malicious PDF — malware analysis report

Static analysis result for SHA-256 9330cd6f60001a29…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 00:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a5a938c1b5f19b2f4dda8df0e446e89a SHA-1: 41a6ced51574804ba12870d80025a1347965d83c SHA-256: 9330cd6f60001a29d23a5f4b220abb96cbc78a7f3c106eb06fe44afd18c32a49
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://chiengthai.com/file_media/file_image/file/nopinidigadopetijeg.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21f9ac9c4---sofupejusawudelu.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/getubujonegivor.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4kg4mfmjub4uk86jj6ipgl35s/15910058934.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ac11c5d43---55495798960.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d0e1b9ea---fotud.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/30894416902.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/jebuj.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153234193107.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e556efc9b---zutozivomodarumuwal.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92283975025.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kinigojepatenemu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626182441xatemelogov.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/04f174d26cd2d2ea255063fb440a9022/risujujujaworefofaza.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/031af25d29b22848c4af7af3a5a1ea61/kavipabup.pdfIn PDF document text
    • https://bem-sa.com/img/file/54527889271.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/pikarawininevugosaxofer.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795a4030eca---75800653031.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be91bb1319f---2220945393.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5732173330---jejulafanome.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/wenolunivofeg.pdfIn PDF document text
    • http://ridendo.cz/files/file/89093914194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=perbedaan+kopi+robusta+arabika+dan+liberika+pdfPDF 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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16452 bytes
SHA-256: 3b8e7eedf66371b21a3271325a4053ef6f13f3f10c814ef98ba446f7b3bc5b07
font_01_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 10824 bytes
SHA-256: b8b6f77869dc00c794298cff50bd54b73806cdd4098c66acf4b3a03d73a06438
font_02_sfnt_off00013a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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