Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62dbcc2923970d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 21:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2dd41153f5c381c6aea88953845cb0bf SHA-1: 65e73918c0726879e2c7ac2d8f3fa4179961df35 SHA-256: e62dbcc2923970d0f8bd3b97d74055388d46c5dfff9834bf8d898590d36bedf1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised domains and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and a link farm heuristic indicates a strong intent to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bielle-srl.com/userfiles/files/jefalole.pdf In PDF document text
    • https://gizaviation.com/uploads/files/zavewesetusetudujet.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/99264956167.pdfIn PDF document text
    • http://elitacasa.it/images/file/vebiguwovopuzi.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/titusabinesefenarafuro.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/tumiwudot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/657f32aa5db55e4c52a46b26120c0be4/garugiriwuvegibamul.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/62289298370.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/naxovotosufekidabokuwedow.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/92935635587.pdfIn PDF document text
    • https://upaspor.com/resimler/files/58370812329.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/72372283005.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mb3edk5c7iug15id200m6nil5u/28997493876.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/72007498048.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/tubevew.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/melefigepit.pdfIn PDF document text
    • https://kaparatt.com/images/File/83999352737.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xomenikokaza.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/winizejoxut.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/64242962062.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/25012416527.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/57587794397.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86685773337.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9a4f7947052696fb7b87ed7bed6c1d8e/50310856568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=schoolgirls+simulator+mod+apkPDF 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10992 bytes
SHA-256: 17e3908cd3820cb707c1aed9f356d65700d3a13441c7921c662dc40541c46c0a
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 17748 bytes
SHA-256: ba22e43eb55285c24703fdc5dafdc2dadeeb48cdcdfc17dceb70a65ea4f33a95
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1