Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62f58f8d5d39f9f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 14:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7fe434b1760e842c274cad21eeedbb9 SHA-1: 863bfe08d4576e661c4a3f38be351f694839cf5d SHA-256: f62f58f8d5d39f9f6e3f7b9b8bd26284f328a7f92e576ef5102ee7baa3e9077e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier also strongly indicated maliciousness. The file's purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.superior-inkjet.com/login/ckfinder/userfiles/files/sujawesosuna.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/664fc7a6fc25f4f8ac611903530ba483/98215528749.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152753d94adf---34296802453.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/loladu.pdfIn PDF document text
    • http://stisk.com/file/10822718532.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/kotuz.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/11255840326.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dozaxozonexezakiwekeju.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/49095315565.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/37574858164.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/43409098627.pdfIn PDF document text
    • http://schokobrunnen.com/idata/91515939962.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1caa15d02f00620e6dd485396d17bb57/78076570139.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/71273463490.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/kesoxemanud.pdfIn PDF document text
    • http://salt17.com/userfiles/files/dukomitide.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/varemudekosojasakezok.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/61156011112.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/fewubawelufininanexig.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/75820196293.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/32579256993.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/gututufapisofabufavup.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219231536457003.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bowemudikekinirumatutal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=basic+electronics+solid+state+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_off0000b3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BE 10668 bytes
SHA-256: 2df0dd317fe4212494a4ae20ee4da7ebd25baedb259482c78944ff71bc771ecf
font_01_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 15820 bytes
SHA-256: 5388db33b33974e62a4d8aaf7f275e85666ce7215ffdcca96db8ed7ee400fe39
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1