Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0e557c770d742c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 01:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5ba236475e9d27e5846437830d85ced SHA-1: b87b9c960b36fa8333e75166478e3ff08d4dd9bd SHA-256: 1b0e557c770d742c88a434f67de2afa6fe1324fe2c00add9f19fe4e88b38c5ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm pointing to compromised websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fbkd8nei103v6jpm8hmsq0ijs5/genagigaxatu.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e2785395---5837003518.pdfIn PDF document text
    • https://eclearusa.com/images/file/sewosinufiw.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2d65e25---vinorusopezerobew.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/ledodedirudevorevutamix.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/gesodaludumokevun.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/2760481881.pdfIn PDF document text
    • https://actorconseil.com/files/file/87392004011.pdfIn PDF document text
    • http://edallyshop.com/upload/files/65422425560.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb246c6---2495148308.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54212515981.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/buzupapibiju.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062820365470554.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/o855dorqf0prblb71bh34fe2m5/lajetu.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/badatez.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///72909583198.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/45989415699.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/20940370938.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/nepolejano.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/gufoxuladesi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/235865e8082392a3ff54d98c685fcb8f/71019961543.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/71973455000.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070667d0a6ec---25241500871.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa9a6e6e1---mexix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+we+read+pdf+books+in+kindlePDF 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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 14784 bytes
SHA-256: d296340ab800661fd6f37dd29a9aff340f9d3b20d16e840b260d9b9798c25c89
font_02_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 10740 bytes
SHA-256: 0d48d49cf557e5d292dddc68e3af4f8f5b8d8044894e1849b89537db80c1af7d