Malicious PDF — malware analysis report

Static analysis result for SHA-256 d402bd24d22e6056…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 03:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f7724180ea2c75d3fa195c0dbf4fa95 SHA-1: 8cbdd1a93056219944921ae9bb2ba2d60ebdd18d SHA-256: d402bd24d22e6056126becb8ebe8e7578535cfb20a47d4519008a8387ff9b793
204 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 the presence of malicious links, including links to compromised WordPress uploads and link farms on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to download and execute a second-stage payload from one of the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fallahi-sch.com/userfiles/file/zameje.pdf In PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/61186136095.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/94303808547.pdfIn PDF document text
    • http://emannsltd.com/userfiles/fojafanuzowaluw.pdfIn PDF document text
    • http://billsky.ee/files/file/fazivozexijobog.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/zejimibugotij.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xodaxaxiwuwidimoledurekiz.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/23330853453.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73a2da0d1---nawalemekesufadodu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/69ccf1858a3d9bdcfeeddc8d779b0531/deviso.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/90335373107.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f6f0b4ab2f5429458934e19a3985d2f0/8231512546.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/torobuzuxolemazelegub.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/73657000542.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/naj2hgpmuvbdbn0q0n5jdpeejp/weludeb.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/navavuxozeger.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085374abc8b3---fepezaselari.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1915ade56---wavuvuzikefadojadusujabus.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/66081446666.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7056e544909ae21e95cb4c8776211a55/29372609152.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88836060881.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160903d3c006b0---58186713517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=engineering+aptitude+test+questions+and+answers+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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 20232 bytes
SHA-256: 2a85e902ac5751323066c7b8c1656d270a02b744b4438c28e18748acca036fd0
font_01_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 10944 bytes
SHA-256: 15b4854e88438583f8ac025a948b79e650cce9e07f103b811cf8880fca53c69a

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