Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4081451155e87d7…

MALICIOUS

PDF

80.3 KB Created: 2021-07-20 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7465121fbe358176e59d5059ab044fd SHA-1: 0cca7caff7b296abc6ecf1683d4f1b9779cb595c SHA-256: f4081451155e87d74baf92d21d0c529ccbe8cb2965f954dbb94aa2c5cacf102b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ladue69.com/clients/876446/File/69610649319.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976c853df9c---2725444323.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3f71c2af443b0a78f81c577eb78d05b8/21546893729.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/73638080080.pdfIn PDF document text
    • http://clarasonic.com/upload/file/nipal.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0afa54575f92d622177d29e83d8efddc/21760860685.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb28ea1c99---73281634130.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/39905837059.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/12924098461.pdfIn PDF document text
    • http://lactopad.com/uploads/files/ziluxodub.pdfIn PDF document text
    • http://bjjiffy.com/upload/xitakowe.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502101459.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/pesubonubiwaba.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a19216e53d0882e4fba1fdb98ba9359/nowifit.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/jominupuwifafikabug.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/zobosubituka.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f1dot2l1o6igmmjf0o14jqgja0/rumidub.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/70488653944.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/76c0026df2948283c4d17533ec50af3e/guxarejexurupepo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/43245244761.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceed3d5519---20932789635.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e00296734---12004084685.pdfIn PDF document text
    • http://minhanh.com/files/77846198055.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/13142379351.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b492a96759---21967491322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=as+i+lay+dying+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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 16796 bytes
SHA-256: d79206615da18c02fb96eba4e5947f5de27c4054b985255002bfe91275e12b9f
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10316 bytes
SHA-256: 94274e0242f1e0fbd65665042ca413d1aa69396084e1c068e4446966942e901a