Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e26818bac2067…

MALICIOUS

PDF

99.0 KB Created: 2021-09-11 23:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4e1dde37db122234703530f4674e7dd1 SHA-1: d75513e59f04992968ce1365bee00f7ee31553a8 SHA-256: f28e26818bac2067f3a8264aef79f85c3051784c4a07c64c586cf16dbadc363e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://munnarinfo.in/userfiles/file/95269439898.pdf In PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/11640796793.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff25ca180d---3508752106.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/24647295463.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911023115425.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/13554307202.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/pojaz.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/56388784953.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/86180123575.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nefakogedikewaga.pdfIn PDF document text
    • https://alev.az/userfiles/file/powopazematisigizoxati.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/13054974140.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613310594911b---49649796121.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/sepiv.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/75512459765.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e02e97f6---6026956392.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/dakujivovosodipun.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/9000985982.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/vopejojepomupi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b4ab1856---badanevidapuzusitok.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/47474547391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wisdom+share+smart+cloud+tv+android+updatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 18532 bytes
SHA-256: e3e5131cde94752ea5bf4f99b140dec60a2e865432fa217c6a22be62d9eaaf68
font_01_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 10936 bytes
SHA-256: c6a869c478e28af6db075fd9853022d3403bb7185b4e8ab7fe9a105a2deb3cb1
font_02_sfnt_off00014b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B44 17520 bytes
SHA-256: 04abd1cd3d52f587d6ca5bff7c197445cceb0dc9ed6ffcb9688c8833e3f9dfe4
font_03_sfnt_off000165a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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