Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b082c1f2fc20a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 03:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b1d3d1011b845a37f9a9b744181adfe SHA-1: 7567b9522bd2d5cec8dec7888cc64291392123d5 SHA-256: 078b082c1f2fc20af2d815c97665d7b9f41039e5d2d66689db87ce047951acfc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites. Several heuristics indicate that these links are distributed across compromised CMS uploads and disposable hosting, suggesting an intent to lure users to potentially malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cmtoolsrental.com/user_img/files/vazaleguwifaxemazitif.pdf In PDF document text
    • http://gleb777.com/fck_upload/file/22511471457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138218e21de8---mimidipoloraf.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/69460737541.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/10073978681.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/85618564487.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/xemidu.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jububisavulipolobof.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d39e8bf3937b861051d60b15824b617d/39945269054.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/53477894611.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lekabagonedo.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/piborepipawujapitowag.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210915201426815395ilvcttcln15e.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/73173594775.pdfIn PDF document text
    • http://orem.mn/uploads/files/bapuf.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/60928390314.pdfIn PDF document text
    • http://promise-land.com/upload/file/60322177372.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/80508601010.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/736123d2c061534a2fd655844b66bb71/pagekola.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/20186393159.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/wuxene.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/verebipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=animal+crossing+new+horizon+download+androidPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 10848 bytes
SHA-256: c06ea9509b581297de34b095024f05020a67fff864cdeb0d527d6856cd416efa
font_02_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 15364 bytes
SHA-256: 69261ab57e4e92488c8c014b57db1f2148932094264be8a683dd8455a8024db5