Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e0e2de4d565e37…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c291c9313ec4dbbbdf83e473957306c2 SHA-1: cfcb1e122dbdb43b29aa1987edb260a8d4ce9db3 SHA-256: e5e0e2de4d565e379a783caac59870cd591645943da7daf474251f55d663ed44
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various domains, some of which appear to be compromised or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anhuizhkj.com/upload_fck/file/2021-9-6/20210906014719601942.pdf In PDF document text
    • http://fotostudiovaccari.it/userfiles/files/24600114891.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/rokigekekonusaxu.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/nusalatagoduzosutonoge.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/giwurujibuni.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/funuputizuduruwuk.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/81687224041.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/66994017992.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f618ee7967e7636f4eb3b3a4e97e7e0/9529743661.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614473a07ea6b---vinexuvo.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/zirisabekufojofevo.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/54953778318.pdfIn PDF document text
    • http://full814.com/upload/files/47580350775.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/betagekewilopov.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/72355880952.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xizuliwivumatiminiz.pdfIn PDF document text
    • http://elsped.hu/files/file/madanutug.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/76460221304.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455441e3e91---mizimudipofadurabozumed.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3087984b6fe5f004ed6406c7e5bf9eb9/76619708608.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/48294675422.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/lafevekuborojanitalu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/vazezitem.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/kedevup.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/48819866208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+a+pdf+of+a+web+pagePDF 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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 17548 bytes
SHA-256: 314812c5547f3f924e1b400641d0a00cdf86ec9d9a0df9e27870f82a52b79648
font_01_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 10380 bytes
SHA-256: 3e66d3cfe29e7bf2e65c4204e45699068dc695c4a889599c6980d076ea29af2c
font_02_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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