Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ab82c7e3c3827…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 18:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d26fac43ccb1e281d6df738da0c2b468 SHA-1: 314bf9fe0a53e97f581d8f4c560bce5f1779496a SHA-256: 887ab82c7e3c3827feaf3ced141d983fa1e797f40c21f7bc766595ee37808274
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded JavaScript stream and the presence of numerous external URIs, many pointing to compromised or disposable hosting, indicate an attempt to redirect users to malicious sites. The PDF's structure suggests it functions as a link farm, likely to facilitate phishing or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://jackinthegymtpe.com/uploads/files/202109051925537291.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/xagozaxivonex.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87872c7b---68798013679.pdf
    • http://botosani.ro/img/uploads/file/61594500367.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fujojafemuzamil.pdf
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/jifuvatos.pdf
    • http://veszpremkosar.hu/_user/file/japoboziwadafawafiguwem.pdf
    • http://chaukitchen.com/uploads/files/xezovanevezidelivabujufag.pdf
    • http://turinhotelcompany.com/userfiles/files/35116856670.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/45403647821.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210917173212.pdf
    • https://nestsearch.in/admin/uploads/file/75801843526.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/60988110646.pdf
    • https://venefoil.com/ckfinder/userfiles/files/taniwavilovupemirusad.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/22759077592.pdf
    • http://strap.sk/uploads/files/52704500258.pdf
    • https://ce-mi.pl/uploads/userfiles/files/fisevojuvixopixabarejug.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/uf7nht6og3r6mua1mjtt4amsm1/zogakezavi.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/32016717491.pdf
    • http://bancasemecanino.com/userfiles/files/72329708008.pdf
    • http://sbriz.ru/userfiles/file/woruwadelovurilubu.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/40719443016.pdf
    • http://epilia.com/upload/FCKEditorfile/gisemufosas.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/46393106615.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e4b716fc576e0b816bb04026b158f5fa/24879112084.pdf
    • http://drtamerturan.com/file/ligozefuzomos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cara+ganti+password+gmail+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
font_01_sfnt_off0000fb22.bin
6891dc2b888acdf44078ca5ab6c125f64429a89973f7da5adf60456020c1447c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10720 bytes
font_02_sfnt_off0001138c.bin
a697601fbda79eb99fe0975eb2d7397bfabdb8f5abf6fd62634cd50f0f397e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 17844 bytes