Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bded4aa28aefc7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 20:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd89430952dff56563b9136cb7b2853a SHA-1: 1cc250b8d2f5ed10c58c4352c7a07952daf028d0 SHA-256: 14bded4aa28aefc720245ebb83568ffe028397cd6f4d4d1aae0bbe96e74a9fdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://hidropro.hu/upload/66397847836.pdf In PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/roxosemiladukuduwu.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/22414673681.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/79946873577.pdfIn PDF document text
    • http://teifsepahan.com/files/file/fulenirag.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a6e009975208d258e9178e3cebb406b1/20832695329.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pekobamifi.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/ninidowolowetufasumuzo.pdfIn PDF document text
    • http://citranco.com/users/files/medanubexipalo.pdfIn PDF document text
    • http://strandedtattoo.net/file/gujexivotuduvewiwu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d1201b5486e5a3ec762c44f6f72dad9/38481337018.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/31537432035.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/210902063500679422pc0xoee6bk2t.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/4680379924.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8622150d---zubazuxewilevixivazav.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/numifilakaturuvutop.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/98370467489.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bumobafejovesopovabami.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e85098a903fe64adead6b8c3b5323a0e/47930334101.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/jegidijifutuvukaze.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/36874399172.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/bagivorikebada.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/95587907748.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/163055885261452f65471bc.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/telim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=play+store+happymod+apkPDF 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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 17788 bytes
SHA-256: b047aa29dc61df6835f975af7106b2a3a2926064eabdab28efe8024cc9dd46e8
font_01_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 10668 bytes
SHA-256: dddb4a9a368cb1dad86e421f93ed2b96a2873380b26c76d2bed4e2128c64942f

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